Leviticus 13:12-13
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12If the leprosy break out abroad in the skin, and the leprosy cover all the skin of [him who has] the plague from his head even to his feet, as far as appears to the priest; 13then the priest shall look; and, behold, if the leprosy have covered all his flesh, he shall pronounce [him] clean [who has] the plague: it is all turned white: he is clean.
Leviticus 13:12-13 (WEB)