For the source text click/tap here: Nedarim 36
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One who vowed not to provide any benefit to his fellow is not allowed to teach him Torah; however, he is allowed to teach him the moral lessons and stories about the Torah (Midrash), as well as teach Torah to his sons and daughters.
Basically, why should Torah be taught for free?
Moses said, "Look, I taught you the Torah, for free, just as God commanded me," - and you should also teach for free.
Then if so, why is teaching Torah considered a benefit, which one should not confer on his fellow if he vowed against him? -
We mean teaching the written Torah, and their one takes money for teaching the melody, not the words.
Alternatively, the art of reading the written Torah is usually taught to small children, and one receives money for being their babysitter rather than teacher. Moral lesson are for adults though, and there one cannot take the reward.
We explore the ramifications of teaching Torah and the need for supporting teachers.