Reference for Zevachim 231:6

ודילמא נח גופיה טריפה הוה תמים כתיב ביה ודילמא תמים בדרכיו צדיק כתיב ביה

But perhaps [it means that he was] whole in his ways and righteous in his actions? - If you should think that Noah himself was trefah, could the Merciful One say to Noah, Take in [only] such as are like thee, [but] do not take in whole [animals]?<span class="x" onmousemove="('comment',' That is obviously absurd.');">¹⁰</span> Now, since we infer it from 'with thee', what is the purpose of 'to keep seed alive'? - You might think that 'with thee' meant merely for companionship, [so they might be] even aged or castrated.

Jastrow