Genesis 9:20-24

Then Noah, a man of the soil, was first to plant a vineyard. He drank some of the wine, got drunk, and was uncovered in his tent. Then Ham, Canaan’s father, saw his father’s private parts and told his two brothers outside. So 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. When Noah woke up from his wine, he learned what his youngest son had done to him.