Sanhedrin 108a:

The School of R. Ishmael taught: The doom [of destruction] was decreed against Noah too, but that he found favour in the eyes of God, as it is written, It repenteth me that I have made them. But Noah found grace in the eyes of the Lord.35

And the Lord was comforted that he had made man in the earth.36 When R. Dimi came37 he said: The Holy One, blessed be He, exclaimed, ‘I did well in preparing graves for them in the earth.’38 How is this signified [by the verse]? — Here is written, And the Lord was comforted;39 whilst elsewhere it is stated, And he comforted them, and spake kindly to them.40 Others say, [He exclaimed,] ‘I did not do well in establishing graves for them in the earth;’41 here it is written, And it repented the Lord; whilst elsewhere it is written, And the Lord repented of the evil which he had thought to do unto his people.42