Genesis 9:21

19These three were the sons of Noah, and from these the whole earth was populated.

20Noah began to be a farmer, and planted a vineyard.

21He drank of the wine and got drunk. He was uncovered within his tent.

22Ham, the father of Canaan, saw the nakedness of his father, and told his two brothers outside.

23Shem and Japheth took a garment, and laid it on both their shoulders, went in backwards, and covered the nakedness of their father. Their faces were backwards, and they didn’t see their father’s nakedness.