(4) Hear, O Israel! יהוה is our God, יהוה alone.*יהוה is our God, יהוה alone Cf. Rashbam and Ibn Ezra; see Zech. 14.9. Others “The Lord our God, the Lord is one.” (5) You shall love your God יהוה with all your heart and with all your soul and with all your might. (6) Take to heart these instructions with which I charge you this day. (7) Impress them upon your children. Recite them when you stay at home and when you are away, when you lie down and when you get up. (8) Bind them as a sign on your hand and let them serve as a symbol (9) inscribe them on the doorposts of your house and on your gates.
(13) If, then, you obey the commandments that I enjoin upon you this day, loving your יהוה and serving [HaShem] with all your heart and soul, (14) I will grant the rain for your land in season, the early rain and the late. You shall gather in your new grain and wine and oil— (15) I will also provide grass in the fields for your cattle—and thus you shall eat your fill. (16) Take care not to be lured away to serve other gods and bow to them. (17) For יהוה’s anger will flare up against you, shutting up the skies so that there will be no rain and the ground will not yield its produce; and you will soon perish from the good land that יהוה is assigning to you. (18) Therefore impress these My words upon your very heart and self. bind them as a sign on your hand and let them serve as a symbol on your forehead, (19) and teach them to your children—reciting them when you stay at home and when you are away, when you lie down and when you get up; (20) and inscribe them on the doorposts of your house and on your gates— (21) to the end that you and your children may endure, in the land that יהוה swore to your fathers to assign to them, as long as there is a heaven over the earth.
(א) בִּרְכַּת הַמְזוּזָה
(ב) הקובע מזוזה מברך:
(ג) בָּרוּךְ אַתָּה יְהֹוָה אֱלֹהֵינוּ מֶלֶךְ הָעוֹלָם, אֲשֶׁר קִדְּשָׁנוּ בְּמִצְוֹתָיו וְצִוָּנוּ לִקְבֹּעַ מְזוּזָה:
Barukh ata Eloheinu melekh ha-olam, asher kiddeshanu be-mitzvotav ve-tzivvanu likboa mezuzah.
Blessed are You, Adonai, Ruler of the universe, who has sanctified us with His commandments and commanded us to affix a mezuzah....
Way back in the 11th century, Rashi, a French rabbi and commentator, opined that when you put up your mezuzah, it should be hung vertically (Rashi and Tosafot on Menahot 33a). But then Rashi’s grandson came along. He’s known as Rabbenu Tam, and he wrote that a mezuzah should be affixed horizontally, because the Ten Commandments and the
scrolls were kept horizontally in the in the Temple. A hundred and fifty years later Rabbi Jacob Ben Asher, also sometimes called the Tur, was writing his book of Jewish law, the Arbaah Turim. In it, Ben Asher suggests that the way to hold by the precedents of both Rashi and Rabbenu Tam was to split the difference, and affix your mezuzah at a slant (pointing into the room). (Yoreh Deah 289)
The Sages taught in a baraita: The Jewish people are beloved, as the Holy One, Blessed be He, surrounded them with mitzvot: They have phylacteries on their heads, and phylacteries on their arms, and ritual fringes on their garments, and a mezuza for their doorways. Concerning them David said: “Seven times a day I praise You, because of Your righteous ordinances” (Psalms 119:164). This alludes to the two phylacteries, the four ritual fringes, and the mezuza, which total seven.
Rabbi Eliezer ben Ya’akov says: Anyone who has phylacteries on his head, phylacteries on his arm, ritual fringes on his garment, and a mezuza on his doorway is strengthened from all sides so that he will not sin, as it is stated in the verse: “And a threefold cord is not quickly broken” (Ecclesiastes 4:12). This is interpreted as an allusion to the three mitzvot of phylacteries, ritual fringes, and mezuza. And the verse states: “The angel of the Lord encamps round about them that fear Him, and delivers them” (Psalms 34:8). This is interpreted to mean that the angel of the Lord surrounds those who fulfill the mitzvot and saves them from missing the mark.