TT #30 · Parashas Noach · Third Aliyah · Passuk 8:7
And he sent out the raven; it went to and fro until the waters had dried up from the earth.
Torah Temimah points to Sanhedrin 108b (Reish Lakish — the raven’s answer to Noach).
E-Daf image — Sanhedrin 108b (size=3)
Shas / HebrewBooks PDF of the daf
English: “And he sent out the raven” — Reish Lakish said: The raven gave Noach a crushing answer. It said to him: “Your Master hates me and you hate me. Your Master hates me — for He said of the pure seven and of the impure two; and you hate me — for you leave those of the seven and send one of the two. If the angel of heat or cold strikes me, one creature will be missing from the world.”
Custom (aggadic dialogue explaining the raven’s reluctance).
The raven objected that it was unfair to risk the only remaining pair of its species while pure birds were present in sevens.