Deriving from what is already derived (למד מן הלמד).  Whether one may learn laws from a verse which laws have already been learned from is critical point of dissention between Rabbi Ishmael and Rabbi Akive. The Talmud Yerushalmi which minimizes deriving laws from a verse which already has laws derived from it follows Rabbi Ishmael, while the Talmud Bavli for which ‘learning from the learned’ is normal follows Rabbi Akiva.

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