Yerushalmi Sanhedrin
Said R. Yoḥanan, “One who does not know how to derive that a reptile is pure and impure in one hundred ways, may not investigate [testimony] in merit [of the defendant].”
Rabbi said, “My master had a distinguished student who could purify the reptile or make it impure in one hundred ways.”
They say, “That student did not know how to issue rulings.”…
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