Reference for Bekhorot 6:10
רַבִּי חֲנִינָא בֶּן אַנְטִיגְנוֹס אוֹמֵר, אֶת שֶׁיַּבֶּלֶת בְּעֵינוֹ, וְשֶׁנִּפְגַּם עֶצֶם יָדוֹ, וְעֶצֶם רַגְלוֹ, וְשֶׁנִּפְסַק עַצְמוֹ שֶׁבְּפִיו. עֵינוֹ אַחַת גְּדוֹלָה וְאַחַת קְטַנָּה, אָזְנוֹ אַחַת גְּדוֹלָה וְאַחַת קְטַנָּה, בְּמַרְאֶה אֲבָל לֹא בְמִדָּה. רַבִּי יְהוּדָה אוֹמֵר, אַחַת מִבֵּיצָיו גְּדוֹלָה כִּשְׁתַּיִם בַּחֲבֶרְתָּהּ, וְלֹא הוֹדוּ לוֹ חֲכָמִים:
Rabbi Chanina ben Antignos says: If it has a wart in its eye, or if its foreleg or hindleg was missing a piece or if the bone in its mouth [i.e. the jawbone] is split, f one eye is bigger than the other or if one ear is bigger than the other - [as judged] by appearance but not [if it must] be measured. Rabbi Yehuda says, if one of its testicles is twice as large as the other [it is a blemish] but the Sages disagree.
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