Genesis 9:20-23

20And Noah began [to be] a husbandman, and planted a vineyard.

21And he drank of the wine, and was drunken, and he uncovered himself in his tent.

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

23And Shem and Japheth took the upper garment and both laid [it] upon their shoulders, and went backwards, and covered the nakedness of their father. And their faces were turned away, that they saw not their father's nakedness.