Lev Leviticus, chapter Book of Leviticus, chapter 13
And the Priest shall looke on the sore in the skinne of his flesh: if the heare in the sore be turned into white, and the sore seeme to be lower then the skinne of his flesh, it is a plague of leprosie. therefore the Priest shall looke on him, and pronounce him vncleane: Num 14:12