Genesis 9:23-25

23And Shem and Japheth took the upper garment and both laid [it] upon their shoulders, and went backwards, and covered the nakedness of their father. And their faces were turned away, that they saw not their father's nakedness.

24And Noah awoke from his wine, and learned what his youngest son had done to him.

25And he said, Cursed be Canaan; Let him be a bondman of bondmen to his brethren.