Genesis 9:20-23

Noah became a farmer and planted a vineyard. When he drank wine made from his grapes, he became drunk and lay naked in his tent. Ham, the father of Canaan, looked at his naked father and told his brothers outside. Then Shem and Japheth got a coat and, carrying it on both their shoulders, they walked backwards into the tent and covered their father. They turned their faces away so that they did not see their father’s nakedness.