Genesis 9:22-25New International Version (NIV)

22 Ham, the father of Canaan, saw his father naked and told his two brothers outside. 23 But Shem and Japheth took a garment and laid it across their shoulders; then they walked in backward and covered their father’s naked body. Their faces were turned the other way so that they would not see their father naked.

24 When Noah awoke from his wine and found out what his youngest son had done to him, 25 he said,

“Cursed be Canaan!
    The lowest of slaves
    will he be to his brothers.”