(6) Yehoshua ben Perachyah and Nittai the Arbelite received [the oral tradition] from them. Yehoshua ben Perachyah used to say: appoint for thyself a teacher, and acquire for thyself a companion and judge all men with the scale weighted in his favor.

(6) Greater is learning Torah than the priesthood and than royalty, for royalty is acquired by thirty stages, and the priesthood by twenty-four, but the Torah by forty-eight things: By study, Attentive listening, Proper speech, By an understanding heart, By an intelligent heart, By awe, By fear, By humility, By joy, By attending to the sages, By critical give and take with friends, By fine argumentation with disciples, [...]

[Referring back to text #1 (Pirkei Avot 1:6)...

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Acquire for yourself a friend - how? It teaches that one should acquire a friend to eat with, drink with, read with, study with, and sleep with, revealing to them all one's secrets, those of Torah and those of worldly affairs. And when you sit and learn Torah together, if one of you makes a mistake, e.g. in Halachah or properly ordering the material, calling the impure pure or the pure impure, the forbidden permitted or the permitted forbidden, then your friend can correct you. And from what [Scriptural source] do we know that a friend correcting another brings good reward to their endeavors? As it was said, "Two are better than one, as they have good reward in their endeavors."

Rabbi Ḥama, son of Rabbi Ḥanina, said: What is the meaning of that which is written: “Iron sharpens iron, so a person sharpens the countenance of his friend?” (Proverbs 27:17) This verse comes to tell you that just as with these iron implements, one sharpens the other, so too, when Torah scholars study together, they sharpen one another in halakha. Rabba bar bar Ḥana said: Why are matters of Torah compared to fire, as it is stated: “Is not My word like fire, says the Lord?” (Jeremiah 23:29) To tell you: Just as fire does not ignite in a lone stick of wood but rather in a pile of kindling, so too, matters of Torah are not retained and understood properly by a lone scholar who studies by himself, but by a group of Sages.

Rav Naḥman bar Yitzḥak said: Why are Torah matters likened to a tree, as it is stated: “It is a tree of life to them who lay hold upon it?” (Proverbs 3:18) This verse comes to tell you that just as a small piece of wood can ignite a large piece, so too, minor Torah scholars can sharpen great Torah scholars and enable them to advance in their studies. And this is what Rabbi Ḥanina said: I have learned much from my teachers and even more from my friends, but from my students I have learned more than from all of them.

The Gemara asks: What is the meaning of the phrase “enemies in the gate” with regard to Torah study? Rabbi Ḥiyya bar Abba says: Even a father and his son, or a rabbi and his student, who are engaged in Torah together in one gate become enemies with each other due to the intensity of their studies. But they do not leave there until they love each other, as it is stated: “Therefore it is said in the book of the Wars of the Lord, Vahev in Suphah [beSufa], and the valleys of Arnon” (Numbers 21:14). The word “vahev” is interpreted as related to the word for love, ahava. Additionally, do not read this as “in Suphah [beSufa]”; rather, read it as “at its end [besofa],” i.e., at the conclusion of their dispute they are beloved to each other.