Reference for Zevachim 231:8

ומאחר דנפקא לן מאתך לחיות זרע למה לי מהו דתימא אתך לצותא בעלמא אפי' זקן אפילו סריס קמשמע לן:

Were there then clean and unclean [animals] at that time?<span class="x" onmousemove="('comment',' Before the Torah was given.');">¹¹</span> - Said R'Samuel B'Nahmani in R'Jonathan's name: [It means] of those with which no sin had been committed.<span class="x" onmousemove="('comment',' Those which had mated only with their kind.');">¹²</span>

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