(1) On the eighth day Moses called Aaron and his sons, and the elders of Israel. (2) He said to Aaron: “Take a calf of the herd for a sin offering and a ram for a burnt offering, without blemish, and bring them before יהוה. (3) And speak to the Israelites, saying: Take a he-goat for a sin offering; a calf and a lamb, yearlings without blemish, for a burnt offering; (4) and an ox and a ram for an offering of well-being to sacrifice before יהוה; and a meal offering with oil mixed in. For today יהוה will appear to you.” (5) They brought to the front of the Tent of Meeting the things that Moses had commanded, and the community leadership came forward and stood before יהוה. (6) Moses said: “This is what יהוה has commanded that you do, that the Presence of יהוה may appear to you.” (7) Then Moses said to Aaron: “Come forward to the altar and sacrifice your sin offering and your burnt offering, making expiation for yourself and for the people; and sacrifice the people’s offering and make expiation for them, as יהוה has commanded.” (8) Aaron came forward to the altar and slaughtered his calf of sin offering. (9) Aaron’s sons brought the blood to him; he dipped his finger in the blood and put it on the horns of the altar; and he poured out the rest of the blood at the base of the altar. (10) The fat, the kidneys, and the protuberance of the liver from the sin offering he turned into smoke on the altar—as יהוה had commanded Moses; (11) and the flesh and the skin were consumed in fire outside the camp. (12) Then he slaughtered the burnt offering. Aaron’s sons passed the blood to him, and he dashed it against all sides of the altar. (13) They passed the burnt offering to him in sections, as well as the head, and he turned it into smoke on the altar. (14) He washed the entrails and the legs, and turned them into smoke on the altar with the burnt offering. (15) Next he brought forward the people’s offering. He took the goat for the people’s sin offering, and slaughtered it, and presented it as a sin offering like the previous one. (16) He brought forward the burnt offering and sacrificed it according to regulation. (17) He then brought forward the meal offering and, taking a handful of it, he turned it into smoke on the altar—in addition to the burnt offering of the morning. (18) He slaughtered the ox and the ram, the people’s sacrifice of well-being. Aaron’s sons passed the blood to him—which he dashed against every side of the altar— (19) and the fat parts of the ox and the ram: the broad tail, the covering [fat], the kidneys, and the protuberances of the livers. (20) They laid these fat parts over the breasts; and Aaron turned the fat parts into smoke on the altar, (21) and elevated the breasts and the right thighs as an elevation offering before יהוה —as Moses had commanded.
(22) Aaron lifted his hands toward the people and blessed them; and he stepped down after offering the sin offering, the burnt offering, and the offering of well-being. (23) Moses and Aaron then went inside the Tent of Meeting. When they came out, they blessed the people; and the Presence of יהוה appeared to all the people. (24) Fire came forth from before יהוה and consumed the burnt offering and the fat parts on the altar. And all the people saw, and shouted, and fell on their faces.
(ח) וַיְדַבֵּ֣ר יְהֹוָ֔ה אֶֽל־אַהֲרֹ֖ן לֵאמֹֽר׃ (ט) יַ֣יִן וְשֵׁכָ֞ר אַל־תֵּ֣שְׁתְּ ׀ אַתָּ֣ה ׀ וּבָנֶ֣יךָ אִתָּ֗ךְ בְּבֹאֲכֶ֛ם אֶל־אֹ֥הֶל מוֹעֵ֖ד וְלֹ֣א תָמֻ֑תוּ חֻקַּ֥ת עוֹלָ֖ם לְדֹרֹתֵיכֶֽם׃ (י) וּֽלְהַבְדִּ֔יל בֵּ֥ין הַקֹּ֖דֶשׁ וּבֵ֣ין הַחֹ֑ל וּבֵ֥ין הַטָּמֵ֖א וּבֵ֥ין הַטָּהֽוֹר׃ (יא) וּלְהוֹרֹ֖ת אֶת־בְּנֵ֣י יִשְׂרָאֵ֑ל אֵ֚ת כׇּל־הַ֣חֻקִּ֔ים אֲשֶׁ֨ר דִּבֶּ֧ר יְהֹוָ֛ה אֲלֵיהֶ֖ם בְּיַד־מֹשֶֽׁה׃ {פ}
(יב) וַיְדַבֵּ֨ר מֹשֶׁ֜ה אֶֽל־אַהֲרֹ֗ן וְאֶ֣ל אֶ֠לְעָזָ֠ר וְאֶל־אִ֨יתָמָ֥ר ׀ בָּנָיו֮ הַנּֽוֹתָרִים֒ קְח֣וּ אֶת־הַמִּנְחָ֗ה הַנּוֹתֶ֙רֶת֙ מֵאִשֵּׁ֣י יְהֹוָ֔ה וְאִכְל֥וּהָ מַצּ֖וֹת אֵ֣צֶל הַמִּזְבֵּ֑חַ כִּ֛י קֹ֥דֶשׁ קׇֽדָשִׁ֖ים הִֽוא׃ (יג) וַאֲכַלְתֶּ֤ם אֹתָהּ֙ בְּמָק֣וֹם קָד֔וֹשׁ כִּ֣י חׇקְךָ֤ וְחׇק־בָּנֶ֙יךָ֙ הִ֔וא מֵאִשֵּׁ֖י יְהֹוָ֑ה כִּי־כֵ֖ן צֻוֵּֽיתִי׃ (יד) וְאֵת֩ חֲזֵ֨ה הַתְּנוּפָ֜ה וְאֵ֣ת ׀ שׁ֣וֹק הַתְּרוּמָ֗ה תֹּֽאכְלוּ֙ בְּמָק֣וֹם טָה֔וֹר אַתָּ֕ה וּבָנֶ֥יךָ וּבְנֹתֶ֖יךָ אִתָּ֑ךְ כִּֽי־חׇקְךָ֤ וְחׇק־בָּנֶ֙יךָ֙ נִתְּנ֔וּ מִזִּבְחֵ֥י שַׁלְמֵ֖י בְּנֵ֥י יִשְׂרָאֵֽל׃ (טו) שׁ֣וֹק הַתְּרוּמָ֞ה וַחֲזֵ֣ה הַתְּנוּפָ֗ה עַ֣ל אִשֵּׁ֤י הַחֲלָבִים֙ יָבִ֔יאוּ לְהָנִ֥יף תְּנוּפָ֖ה לִפְנֵ֣י יְהֹוָ֑ה וְהָיָ֨ה לְךָ֜ וּלְבָנֶ֤יךָ אִתְּךָ֙ לְחׇק־עוֹלָ֔ם כַּאֲשֶׁ֖ר צִוָּ֥ה יְהֹוָֽה׃ (טז) וְאֵ֣ת ׀ שְׂעִ֣יר הַֽחַטָּ֗את דָּרֹ֥שׁ דָּרַ֛שׁ מֹשֶׁ֖ה וְהִנֵּ֣ה שֹׂרָ֑ף וַ֠יִּקְצֹ֠ף עַל־אֶלְעָזָ֤ר וְעַל־אִֽיתָמָר֙ בְּנֵ֣י אַהֲרֹ֔ן הַנּוֹתָרִ֖ם לֵאמֹֽר׃ (יז) מַדּ֗וּעַ לֹֽא־אֲכַלְתֶּ֤ם אֶת־הַחַטָּאת֙ בִּמְק֣וֹם הַקֹּ֔דֶשׁ כִּ֛י קֹ֥דֶשׁ קׇֽדָשִׁ֖ים הִ֑וא וְאֹתָ֣הּ ׀ נָתַ֣ן לָכֶ֗ם לָשֵׂאת֙ אֶת־עֲוֺ֣ן הָעֵדָ֔ה לְכַפֵּ֥ר עֲלֵיהֶ֖ם לִפְנֵ֥י יְהֹוָֽה׃ (יח) הֵ֚ן לֹא־הוּבָ֣א אֶת־דָּמָ֔הּ אֶל־הַקֹּ֖דֶשׁ פְּנִ֑ימָה אָכ֨וֹל תֹּאכְל֥וּ אֹתָ֛הּ בַּקֹּ֖דֶשׁ כַּאֲשֶׁ֥ר צִוֵּֽיתִי׃ (יט) וַיְדַבֵּ֨ר אַהֲרֹ֜ן אֶל־מֹשֶׁ֗ה הֵ֣ן הַ֠יּ֠וֹם הִקְרִ֨יבוּ אֶת־חַטָּאתָ֤ם וְאֶת־עֹֽלָתָם֙ לִפְנֵ֣י יְהֹוָ֔ה וַתִּקְרֶ֥אנָה אֹתִ֖י כָּאֵ֑לֶּה וְאָכַ֤לְתִּי חַטָּאת֙ הַיּ֔וֹם הַיִּיטַ֖ב בְּעֵינֵ֥י יְהֹוָֽה׃ (כ) וַיִּשְׁמַ֣ע מֹשֶׁ֔ה וַיִּיטַ֖ב בְּעֵינָֽיו׃ {פ}
(1) Now Aaron’s sons Nadab and Abihu each took his fire pan, put fire in it, and laid incense on it; and they offered before יהוה alien fire, which had not been enjoined upon them. (2) And fire came forth from יהוה and consumed them; thus they died at the instance of יהוה. (3) Then Moses said to Aaron, “This is what יהוה meant by saying:
Through those near to Me I show Myself holy,
And gain glory before all the people.”And Aaron was silent.
(4) Moses called Mishael and Elzaphan, sons of Uzziel the uncle of Aaron, and said to them, “Come forward and carry your kinsmen away from the front of the sanctuary to a place outside the camp.” (5) They came forward and carried them out of the camp by their tunics, as Moses had ordered.
(6) And Moses said to Aaron and to his sons Eleazar and Ithamar, “Do not bare your heads and do not rend your clothes, lest you die and anger strike the whole community. But your kin, all the house of Israel, shall bewail the burning that יהוה has wrought. (7) And so do not go outside the entrance of the Tent of Meeting, lest you die, for יהוה’s anointing oil is upon you.” And they did as Moses had bidden.
(8) And יהוה spoke to Aaron, saying: (9) Drink no wine or other intoxicant, you or your sons, when you enter the Tent of Meeting, that you may not die. This is a law for all time throughout the ages,
(10) for you must distinguish between the sacred and the profane, and between the impure and the pure; (11) and you must teach the Israelites all the laws which יהוה has imparted to them through Moses.
(12) Moses spoke to Aaron and to his remaining sons, Eleazar and Ithamar: Take the meal offering that is left over from יהוה’s offerings by fire and eat it unleavened beside the altar, for it is most holy. (13) You shall eat it in the sacred precinct, inasmuch as it is your due, and that of your sons, from יהוה’s offerings by fire; for so I have been commanded. (14) But the breast of elevation offering and the thigh of gift offering you [and your wife], and your sons and daughters with you, may eat in any pure place, for they have been assigned as a due to you and your sons from the Israelites’ sacrifices of well-being. (15) Together with the fat of fire offering, they must present the thigh of gift offering and the breast of elevation offering, which are to be elevated as an elevation offering before יהוה, and which are to be your due and that of your sons with you for all time—as יהוה has commanded.
(16) Then Moses inquired about the goat of sin offering, and it had already been burned! He was angry with Eleazar and Ithamar, Aaron’s remaining sons, and said, (17) “Why did you not eat the sin offering in the sacred area? For it is most holy, and it is what was given to you to remove the guilt of the community and to make expiation for them before יהוה. (18) Since its blood was not brought inside the sanctuary, you should certainly have eaten it in the sanctuary, as I commanded.”
(19) And Aaron spoke to Moses, “See, this day they brought their sin offering and their burnt offering before יהוה, and such things have befallen me! Had I eaten sin offering today, would יהוה have thought it was good?” (20) And when Moses heard this, and it was good in his eyes.
It's not that Nadav and Avihu sinned on account of drunkenness, because they hadn't been taught to drink wine when they woke up on that glorious morning, but they died on account of their having added something that the Lord had not commanded them, the Lord wanted to rouse Aaron and his sons that they should be careful with matters of the service, that they should not switch even one small thing. And, behold, it was as if he said, "I knew that from this day forwards, you will not willfully do anything from your own minds, but now I am commanding you to be careful from accidentally going against my commands.
And, therefore, you shall drink neither wine nor beer when you come into the Tent of Meeting, lest you come to change something. And not only that are you being warned with the activity of service, but also when you provide guidance to others in matters of holiness-vs.-sanctity, purity-vs.-impurity, or other matters of particular statutes of the Lord, you should be careful to not drink, lest you err in guidance or their sins to the Lord."
וַיִּקְצֹף עַל אֶלְעָזָר וְעַל אִיתָמָר, וְכֵיוָן שֶׁכָּעַס נִתְעַלְּמָה מִמֶּנּוּ הֲלָכָה. אָמַר רַבִּי הוּנָא בִּשְׁלשָׁה מְקוֹמוֹת כָּעַס משֶׁה וְנִתְעַלְּמָה מִמֶּנּוּ הֲלָכָה, וְאֵלּוּ הֵן: בְּשַׁבָּת, וּבִכְלֵי מַתָּכוֹת, וְאוֹנֵן. וַיִּשְׁמַע משֶׁה וַיִּיטַב בְּעֵינָיו, הוֹצִיא כָּרוֹז לְכָל הַמַּחֲנֶה וְאָמַר, אֲנִי טָעִיתִי אֶת הַהֲלָכָה וְאַהֲרֹן אָחִי בָּא וְלִמֵּד לִי.
(1) Leviticus 10:17 - And Moses was very angry with Elazar and Itamar - and since he was so angry, he forgot the Halacha that an Onan is forbidden to eat from the holy offerings.
And when Moses heard the response of Aaron, and realized that in his anger, he forgot the Halacha, he sent an announcement throughout the camp, "I forgot a Halacha and my brother, Aaron taught me."
(1) יהוה spoke to Moses and Aaron, saying to them: (2) Speak to the Israelite people thus: These are the creatures that you may eat from among all the land animals: (3) any animal that has true hoofs, with clefts through the hoofs, and that chews the cud—such you may eat. (4) The following, however, of those that either chew the cud or have true hoofs, you shall not eat: the camel—although it chews the cud, it has no true hoofs: it is impure for you; (5) the daman—although it chews the cud, it has no true hoofs: it is impure for you; (6) the hare—although it chews the cud, it has no true hoofs: it is impure for you; (7) and the swine—although it has true hoofs, with the hoofs cleft through, it does not chew the cud: it is impure for you. (8) You shall not eat of their flesh or touch their carcasses; they are impure for you. (9) These you may eat of all that live in water: anything in water, whether in the seas or in the streams, that has fins and scales—these you may eat. (10) But anything in the seas or in the streams that has no fins and scales, among all the swarming things of the water and among all the other living creatures that are in the water—they are an abomination for you (11) and an abomination for you they shall remain: you shall not eat of their flesh and you shall abominate their carcasses. (12) Everything in water that has no fins and scales shall be an abomination for you. (13) The following you shall abominate among the birds—they shall not be eaten, they are an abomination: the eagle, the vulture, and the black vulture; (14) the kite, falcons of every variety; (15) all varieties of raven; (16) the ostrich, the nighthawk, the sea gull; hawks of every variety; (17) the little owl, the cormorant, and the great owl; (18) the white owl, the pelican, and the bustard; (19) the stork; herons of every variety; the hoopoe, and the bat. (20) All winged swarming things that walk on fours shall be an abomination for you. (21) But these you may eat among all the winged swarming things that walk on fours: all that have, above their feet, jointed legs to leap with on the ground— (22) of these you may eat the following: locusts of every variety; all varieties of bald locust; crickets of every variety; and all varieties of grasshopper. (23) But all other winged swarming things that have four legs shall be an abomination for you. (24) And the following shall make you impure—whoever touches their carcasses shall be impure until evening, (25) and whoever carries the carcasses of any of them shall wash those clothes and be impure until evening— (26) every animal that has true hoofs but without clefts through the hoofs, or that does not chew the cud. They are impure for you; whoever touches them shall be impure. (27) Also all animals that walk on paws, among those that walk on fours, are impure for you; whoever touches their carcasses shall be impure until evening. (28) And anyone who carries their carcasses shall wash those clothes and remain impure until evening. They are impure for you. (29) The following shall be impure for you from among the things that swarm on the earth: the mole, the mouse, and great lizards of every variety; (30) the gecko, the land crocodile, the lizard, the sand lizard, and the chameleon. (31) Those are for you the impure among all the swarming things; whoever touches them when they are dead shall be impure until evening. (32) And anything on which one of them falls when dead shall be impure: be it any article of wood, or a cloth, or a skin, or a sack—any such article that can be put to use shall be dipped in water, and it shall remain impure until evening; then it shall be pure. (33) And if any of those falls into an earthen vessel, everything inside it shall be impure and [the vessel] itself you shall break. (34) As to any food that may be eaten, it shall become impure if it came in contact with water; as to any liquid that may be drunk, it shall become impure if it was inside any vessel. (35) Everything on which the carcass of any of them falls shall be impure: an oven or stove shall be smashed. They are impure—and impure they shall remain for you. (36) However, a spring or cistern in which water is collected shall be pure, but whoever touches such a carcass in it shall be impure. (37) If such a carcass falls upon seed grain that is to be sown, it is pure; (38) but if water is put on the seed and any part of a carcass falls upon it, it shall be impure for you. (39) If an animal that you may eat has died, anyone who touches its carcass shall be impure until evening; (40) anyone who eats of its carcass shall wash those clothes and remain impure until evening; and anyone who carries its carcass shall wash those clothes and remain impure until evening. (41) All the things that swarm upon the earth are an abomination; they shall not be eaten. (42) You shall not eat, among all things that swarm upon the earth, anything that crawls on its belly, or anything that walks on fours, or anything that has many legs; for they are an abomination. (43) You shall not draw abomination upon yourselves through anything that swarms; you shall not make yourselves impure therewith and thus become impure. (44) For I יהוה am your God: you shall sanctify yourselves and be holy, for I am holy. You shall not make yourselves impure through any swarming thing that moves upon the earth. (45) For I יהוה am the One who brought you up from the land of Egypt to be your God: you shall be holy, for I am holy. (46) These are the instructions concerning animals, birds, all living creatures that move in water, and all creatures that swarm on earth, (47) for distinguishing between the impure and the pure, between the living things that may be eaten and the living things that may not be eaten.
Another meaning of the word והתקדשתם is "sanctify yourselves by means of erecting protective legal fences," i.e. rabbinic ordinances designed to reduce the likelihood of contacting and absorbing impure material. G'd tells us that if you do this: "I in turn will help you become holy." The Torah then spells out in what respect you are going to be holy. כי קדוש אני, "for I am holy;" G'd made His presence amongst us dependent on our keeping ourselves apart from contaminating influences. This is why such people are entitled to the same appellation "holy" as is applied to G'd Himself.