Reference for Sanhedrin 26:12

וחד לא סמיך והא אמר רב יהודה אמר רב ברם זכור אותו האיש לטוב ורבי יהודה בן בבא שמו שאילמלא הוא נשתכחו דיני קנסות מישראל נשתכחו נגרוסינהו אלא

then seventy-one should be the right number! — The difficulty remained unanswered. R. Aha the son of Raba, asked R. Ashi: Is ordination effected by the literal laying on of hands? — [No,] he answered; it is by the conferring of the degree: He is designated by the title of Rabbi and granted the authority to adjudicate cases of kenas.<span class="x" onmousemove="('comment',' V. Glos. ');">³¹</span> Cannot one man alone ordain? Did not Rab Judah say in Rab's name: 'May this man indeed be remembered for blessing — his name is R. Judah b. Baba; were it not for him, the laws of kenas would have been forgotten in Israel.' Forgotten? Then they could have been learned. But

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