Reference for Bekhorot 80:1

ומעשה נמי שלחי התחתון עודף על העליון שאל רשב"ג לחכמים ואמרו

AND IT HAPPENED also THAT THE LOWER JAW WAS LARGER THAN THE UPPER ONE, AND R'SIMEON B. GAMALIEL ASKED THE SAGES [FOR A RULING], AND THEY SAID: THIS IS A BLEMISH.

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