Genesis 9:23

Then Shem and Japheth took a garment and placed it across their shoulders, and walking backward, they covered their father’s nakedness. Their faces were turned away so that they did not see their father’s nakedness.

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, and they saw not their father’s nakedness.