Midrash su Geremia 50:36

R. Chama b. Chanina said: "What is the meaning of the passage (Pr. 27, 17) Iron is sharpened by iron? It means just as iron sharpens another iron, so also when two scholars study together, one sharpens [the intellect of] the other." Rabba b. b. Chana said: "Why are the words of the Torah compared to fire? As it is written (Jer. 23, 29) Is not this my word like the fire? saith the Lord. They are to teach that just as fire cannot burn of itself [without having hold of an object], so the words of the Torah can also not remain with one who is alone." And this is also meant by R. Jose b. Chanina; for R. Jose b. Chanina said: "What is the meaning of the passage (Jer. 50, 36) The sword is against the lying soothsayers and they should become foolish. It means that the sword is against the learned who sit alone and study the Torah in privacy. Moreover, they become foolish; as it is said (No'alu) and they shall become foolish; nay, more, they will commit sins; for it is written here (V'noalu) and they shall become foolish, and it is written there (Num. 12, 11) Wherein we have acted foolishly (No'alnu), and wherein we have sinned; and if you wish I would conclude here from (Is. 19, 13) that The princess of Tzo'an are becoming fools (No'alu)."

R. Tanchum b. Chanilai said: "Why is the tribe of Reuben mentioned first among the cities of safety? Because he was the first to save Joseph from his brothers, as it is written (Gen. 37, 21) And when Reuben heard it, he delivered him out of their hand." R. Simlai lectured: "It is written (Deut. 4, 41) Then Moses separated three cities beyond the Jordan, toward the sunrise. The Holy One, praised be He! said to Moses: 'Thou hast caused the sun to shine toward the murderers (to save them from death)'." R. Simlai lectured: "What is the meaning of the verse (Ecc. 5, 9) He that loveth silver shall not be satisfied with silver; nor he that loveth abundance, will finally have income? He that loveth silver refers to Moses, our master, who, [although] having been aware that the three cities on the other side of the Jordan could not protect [the innocent murderer] until the other three cities were selected; nevertheless he selected them, saying: "A meritorious act which has come to my hand, I shall fulfil;' nor he that loveth abundance, i.e., who is fit to lecture before a crowd? He who possesses all the grain [of knowledge] like the Bible, Mishna, Halacha and Hagada." And this is what R. Elazar said: "What is the meaning of the passage (Ps. 106, 2) Who can express the mighty acts of the Lord? or make all His praise to be heard? This means, who is fit to express the mighty acts of the Lord? He who can make all His praise to be heard." The Rabbis, and according to others, Rabba b. Mari explained this passage thus: "He who loves the abundance [of scholars], possesses the fruit of knowledge"; whereupon the Rabbis fixed their eyes upon Raba b. Rabba who possessed such a quality. R. Ashi said: "He who likes to learn among a crowd of scholars possesses the fruit of their knowledge." And this is what R. Jose b. Chanina said: "What is the meaning of the passage (Jer. 50, 36) The sword is upon the boasters (badim) and they shall become fools? This means the sword may cut the necks of the scholars who study separately [without interchange of ideas] and not only this, but they become also foolish; for it is written here, V'no-alu, (and they become foolish) and there is another passage (Num. 12, 11) For that we have done foolishly, and not only this but they also commit a crime, as it is written (Ib.) And wherein we have sinned. Rabina said: "He who loves to study among a crowd [of students], will possess the grain of knowledge." And this is what Rabbi said: "I learned much from my teachers, more, however, from my colleagues, but from my disciples, I learned the most."

R. Juda again opened in honor of the Torah and expounded Be attentive, and hearken, O Israel, this day art thou become a people. (Deu. 27, 9). "Was the Torah then given unto Israel on that day? Behold! forty years had already elapsed. But this is stated for the purpose of inferring from it that the Torah shall always be as dear and beloved by its students, as if that very day it had been given on Mt. Sinai." R. Tanchum, son of R. Chiya, the man from the village of Achu, said: "You may infer it from the following. A man who is accustomed to read the Sh'm'a, reads it every day, morning and evening; and if he miss but one evening it seems to him as if he had never read the Sh'm'a." Be attentive, i.e., organize yourself into a company for the purpose of studying the Torah, because the Torah can be acquired only if studied in company; for R. Jose, the son of R. Chanina, said: "What is meant by the passage (Jer. 50, 36.) The sword is against the lying soothsayers and they shall become foolish, i.e., the sword is against the learned who sit alone and study the Torah in privacy. Moreover, they become foolish; for it is written here Veno'alu (and they shall become foolish), and it is written there (Num. 12, 11.) No'alnu (wherein we have acted foolishly). Moreover, they will commit sins; for it is said (Ib.) And wherein we have sinned (No'alnu), and if you wish [I conclude] from this (Is. 19, 13.) The prince of Tzo-an are become fools (No'alu)." We can explain in another way: Be attentive and listen, Expose yourselves to being smitten over the study of the Torah, as Resh Lakish said: "Whence do we infer that the Torah will be preserved with him only who is ready to die for her? It is said (Num. 19, 14.) This is the Torah, when a man dieth in a tent." We may explain in another way: Be attentive and listen, O Israel; Be quiet, listen, and then explain it, as Raba said "A man shall first study and then think how to explain it." It was said in the academy of R. Janai, "What is meant by the passage (Pr. 30, 33). For the pressure of milk bringeth forth butter, and the pressure of the nose bringeth forth blood, so the pressure of wrath bringeth forth strife? That is, In whom can you find the butter (the prime) of Torah? who has vomited the milk of his mother's breast on account of her (the Torah). And the pressure of the nose bringeth forth blood, i.e., every disciple who is silent when the provocation of his teacher is upon him the first time, will be rewarded with the knowledge of being able to distinguish between ritually purified blood and unpurified blood. So the pressure of wrath bringeth forth strife, i.e., every disciple who remains silent at the provocation of his teacher once and a second time will be rewarded with the knowledge of being able to distinguish between civil and criminal laws; for we are taught (in a Mishnah) that R. Ishmael says: "He who wants to become wise shall study the civil laws for there is no store (of wisdom) in the entire Torah richer than this (civil law), which is like a flowing well." R. Samuel b. Nachmeini said: "What is meant by the passage (Pr. 30, 32.) If thou hast become degraded by lifting thyself up or, if thou hast devised evil, put thy hand to thy mouth, i.e., He who lowers himself (exposes his ignorance) for the sake of learning the Torah. shall finally be raised; if he muzzle his mouth (is ashamed to ask his teacher) he will have to put his hand to the mouth [when he in turn is questioned]."