Genesis 9:23-25

23Then Shem and Japheth took Noah's coat and they put it between their shoulders. They walked into Noah's tent with their backs to Noah. In this way they covered their father with the coat. They looked away from their father so that they did not see him. They did this because Noah was not wearing any clothes.

24Later, when he was no longer drunk with the wine, Noah woke up. He found out what his youngest son, Ham, had done.

25He said, ‘I curse Canaan! He will become a slave that must serve his brothers.’