Genesis 9:23

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

Genesis 9:22

And Ham, the father of Canaan, saw the nakedness of his father, and told his two brethren without.

Genesis 3:11

And He said, Who told thee that thou [wast] naked? Hast thou eaten of the tree, whereof I commanded thee that thou shouldest not eat?