Reference for Sanhedrin 69:3

אמר רב יהודה אמר רב אמר לו הקב"ה למשה חלק להם בתי דינין מ"ט אילימא משום שאין דנין שנים ביום אחד והאמר רב חסדא לא שנו אלא בשתי מיתות אבל במיתה אחת דנין

Why? Shall we say, because two [men] may not be tried [and sentenced] on the same day?<span class="x" onmousemove="('comment',' By one court; therefore many courts had to be set up, since the culprits were many'. ');">⁵</span> But R. Hisda said: This was taught only with reference to [charges involving] two different modes of execution;<span class="x" onmousemove="('comment',' Since the members of the court would find it difficult to find a plea in favour of the accused in each case. ');">⁶</span>

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