Genesis 9:23-25

23So Shem and Japheth took the cloak and laid it over both their shoulders and walked backwards and with it covered their father’s private parts. But their faces were turned away, so they did not see their father’s private parts.

24When Noah woke up from his wine, he learned what his youngest son had done to him.

25So he said, “Cursed is Canaan: the lowest slave will he be to his brothers.”