פירוש על בראשית 8:21

. מנעריו FROM HIS YOUTH — This word is written without a Vav after the ע so that it may be read as מנעריו which would imply that from the moment the embryo bestirs itself to have an independent existence the evil inclination is given to it (Genesis Rabbah 34:10).

AND THE ETERNAL SAID IN HIS HEART. He did not reveal the matter to a prophet at that time, but on the day He commanded Moses concerning the writing of the Torah He revealed to him that as Noah brought his sacrifice it mounted pleasingly, and He decreed that He will no more smite every living thing. In this regard, I have already written of a secret¹⁷⁷See Ramban above, 6:6. hinted at by our Rabbis.
The sense of the expression, I will not again curse the ground any more for man’s sake is that they were punished because of him for if man had not sinned, they have been spared even though they had also corrupted their ways.

את ריח הניחוח, proving that at that time all these species of ritually pure animals were fit as sacrifices.