Reference for Bekhorot 33:18

רחל בת עז ועז בת רחל ר' מאיר מחייב וחכמים פוטרין

He replied to him: Let us see, we are dealing here with a case where a ewe gave birth to what looked like a goat and its sire was a he-goat<span class="x" onmousemove="('comment',' And he killed the sire with its offspring on the same day.');">¹⁰</span>

Jastrow