Noah awoke from his wine, and he knew what the younger son of Ham had done unto him, and he cursed him, as it is said, "And he said, Cursed be Canaan" (Gen. 9:25). Noah sat and mused in his heart, saying: The Holy One, blessed be He, delivered me || from the waters of the Flood, and brought me forth from that prison, and am I not obliged to bring before Thee a sacrifice and burnt offerings? What did Noah do?
He took from the clean animals an ox and a sheep, and from all the clean birds, a turtle-dove and pigeons; and he built up the first altar upon which Cain and Abel had brought offerings, and he brought four burnt offerings, as it is said, "And Noah builded an altar unto the Lord; and took of every clean beast, and of every clean fowl, and he offered burnt offerings on the altar" (Gen. 8:20). It is written here only, "and he offered burnt offerings on the altar," and the sweet savour ascended before the Holy One, blessed be He, and it was pleasing to Him, as it is said, "And the Lord smelled the sweet savour" (Gen. 8:21).
What did the Holy One, blessed be He, do? He put forth His right hand, and swore to Noah that He would not bring the waters of the Flood upon the earth, as it is said, "For this is as the waters of Noah unto me; for as I have sworn that the waters of Noah should no more go over the earth" (Isa. 54:9). And He gave a sign in the rainbow as a sign of the covenant of the oath between Himself and the people, as it is said, "I do set my bow in the cloud, and it shall be for a token of a covenant" (Gen. 9:13).