Leviticus 13:12-13

And if a leprosy break out abroad in the skin, and the leprosy cover all the skin of {him that hath} the plague from his head even to his foot, wheresoever the priest looketh; Then the priest shall consider: and, behold, {if} the leprosy have covered all his flesh, he shall pronounce {him} clean {that hath} the plague: it is all turned white: he {is} clean.