https://www.btstories.com/after-the-flood/

After the Flood, Noah planted a vineyard. In time he drank some of the wine from his harvest and got drunk. He went to his tent and fell asleep on the floor without any clothes on.

His youngest son saw his father lying there, and went and told his brothers what he had seen. His brothers draped a coat between them and walked backwards into the tent, draping the coat over their father.When Noah woke up, he learned what had happened. So he put a curse on the family of his youngest son, and blessed the families of the other two.