Learning to Do? NO! Learning to Understand & Teach? YES!

Rav Zutra bar Toviya said that Rav said: One who tightens the thread of a stitch on Shabbat is liable to bring a sin-offering. If two parts of a garment that were sewn together begin to separate, and one pulls the thread to reattach them, it is tantamount to having sewn them. The Gemara cites additional halakhot cited by Rav Zutra in the name of Rav. And one who learns even one matter from a magosh, a Persian priest, is liable to receive the death penalty. And one who knows how to calculate astronomical seasons and the movement of constellations, and does not do so, one may not speak with him because his actions are improper. The Gemara proceeds to discuss the additional halakhot cited by Rav Zutra bar Toviya. With regard to the magosh, Rav and Shmuel disagreed. One said that they are sorcerers, while the other said they are heretics. The Gemara adds: Conclude that Rav is the one who said that they are heretics, as Rav Zutra bar Toviya said that Rav said: One who learns one matter from the magosh is liable to receive the death penalty. As, if it should enter your mind that they are sorcerers, wasn’t it written: “When you come into the land which the Lord your God gives you, you shall not learn to do after the abominations of those nations. There shall not be found among you any one that makes his son or his daughter to pass through the fire, one that uses divination, a soothsayer, or an enchanter, or a sorcerer” (Deuteronomy 18:9–10)? And the Sages inferred: You shall not learn to do, but you may learn to understand and to teach the topic of sorcery. Apparently, merely learning about sorcery does not violate a prohibition. Only acting upon that learning is prohibited. Rav, who prohibited learning even a single matter from a magosh, must hold that they are heretics, not merely sorcerers. The Gemara states: Indeed, conclude that Rav is the one who said that they are heretics.

Since the Sages perceived from this retort that his mind was stable, they entered and sat before him at a distance of four cubits, as he was ostracized (see Bava Metzia 59b). It is forbidden to sit within four cubits of an ostracized person. Rabbi Eliezer said to them: Why have you come? They said to him: We have come to study Torah, as they did not want to say that they came to visit him due to his illness. Rabbi Eliezer said to them: And why have you not come until now? They said to him: We did not have spare time. Rabbi Eliezer said to them: I would be surprised if these Sages die their own death, i.e., a natural death. Rather, they will be tortured to death by the Romans. Rabbi Akiva said to him: How will my death come about? Rabbi Eliezer said to him: Your death will be worse than theirs, as you were my primary student and you did not come to study. Rabbi Eliezer raised his two arms and placed them on his heart, and he said: Woe to you, my two arms, as they are like two Torah scrolls that are now being rolled up, and will never be opened again. I have learned much Torah, and I have taught much Torah. I have learned much Torah, and I have not taken away from my teachers, i.e., I have not received from their wisdom, even like a dog lapping from the sea. I have taught much Torah, and my students have taken away from me, i.e., they have received from my wisdom, only like the tiny amount that a paintbrush removes from a tube of paint. Moreover, I can teach three hundred halakhot with regard to a snow-white leprous mark [bebaheret], but no person has ever asked me anything about them. He could not find a student who could fully understand him in those matters. Moreover, I can teach three hundred halakhot, and some say that Rabbi Eliezer said three thousand halakhot, with regard to the planting of cucumbers by sorcery, but no person has ever asked me anything about them, besides Akiva ben Yosef. Rabbi Eliezer described the incident: Once he and I were walking along the way, and he said to me: My teacher, teach me about the planting of cucumbers. I said one statement of sorcery, and the entire field became filled with cucumbers. He said to me: My teacher, you have taught me about planting them; teach me about uprooting them. I said one statement and they all were gathered to one place.

The Gemara returns to the matter at hand: Apparently, Rabbi Akiva learned the halakhot of gathering cucumbers through sorcery from Rabbi Eliezer, not from Rabbi Yehoshua. The Gemara answers: He learned it from Rabbi Eliezer but he did not understand it. Later he learned it from Rabbi Yehoshua, and Rabbi Yehoshua explained it to him. The Gemara asks: How could Rabbi Eliezer have performed that act of sorcery? But didn’t we learn in the mishna that one who performs an act of sorcery is liable? The Gemara answers: Performing sorcery not in order to use it, but in order to teach oneself the halakhot is different, and it is permitted; as the Master says that it is derived from the verse: “You shall not learn to do like the abominations of those nations. There shall not be found among you…one who uses divination, a soothsayer, an enchanter, or a sorcerer” (Deuteronomy 18:9–10), so that you shall not learn, i.e., it is prohibited for you to learn, in order to do, but you may learn, i.e., it is permitted for you to learn, in order to understand the matter yourself and teach it to others.

The Romans brought Rabbi Ḥanina ben Teradyon for judgment, and they said to him: Why did you occupy yourself with the Torah? Rabbi Ḥanina ben Teradyon said to them, citing a verse: “As the Lord my God commanded me” (Deuteronomy 4:5). They immediately sentenced him to death by means of burning, and they sentenced his wife to execution by decapitation, and his daughter was condemned to sit in a brothel [kubba shel zonot]. The Gemara explains the Divine decree that he should receive this punishment: He was sentenced to death by burning, as he would pronounce the ineffable name of God with all of its letters, i.e., as it is spelled. The Gemara asks: And how could he do that? But didn’t we learn in the mishna (Sanhedrin 90a): These are the people who have no share in the World-to-Come: One who says that the Torah is not from Heaven or that there is no source from the Torah for the resurrection of the dead. Abba Shaul says: Also one who pronounces the ineffable name as it is written, with all of its letters, has no share in the World-to-Come. The Gemara answers: Rabbi Ḥanina ben Teradyon did it to teach himself, as it is taught in a baraita with regard to the prohibition against sorcery: “You shall not learn to do” (Deuteronomy 18:9); this indicates: But you may learn to understand and to teach. In other words, certain prohibitions do not apply when one is acting only in order to acquire knowledge of the subject. The Gemara asks: Rather, what is the reason that he was punished? The Gemara answers: He was punished because he would pronounce the ineffable name of God in public, instead of privately. And his wife was condemned to execution by decapitation because she did not protest his doing so. From here the Sages stated: Anyone who has the capability to protest effectively the sinful conduct of another and does not protest is punished for that person’s sin.

לא תלמד לעשות THOU SHALT NOT LEARN TO DO [AFTER THE ABOMINATIONS OF THOSE NATIONS] — thou shalt not learn to do, but you may learn their practices in order to understand them and to teach others, that is to say, to understand their doings, how depraved they are, and thus to be able to teach thy children, “Do not so and so because these are the religious observances of the heathens!” (Sifrei Devarim 170:3; Sanhedrin 68a.)