Leviticus 13:1-8 (NKJV)
The Law Concerning Leprosy
13 And the Lord spoke to Moses and Aaron, saying: 2 “When a man has on the skin of his body a swelling, a scab, or a bright spot, and it becomes on the skin of his body like a leprous sore, then he shall be brought to Aaron the priest or to one of his sons the priests. 3 The priest shall examine the sore on the skin of the body; and if the hair on the sore has turned white, and the sore appears tobe deeper than the skin of his body, it is a leprous sore. Then the priest shall examine him, and pronounce him unclean. 4 But if the bright spot is white on the skin of his body, and does not appear to be deeper than the skin, and its hair has not turned white, then the priest shall isolate the one who has the sore seven days. 5 And the priest shall examine him on the seventh day; and indeedif the sore appears to be as it was, and the sore has not spread on the skin, then the priest shall isolate him another seven days. 6 Then the priest shall examine him again on the seventh day; and indeed if the sore has faded, andthe sore has not spread on the skin, then the priest shall pronounce him clean; it is only a scab, and he shall wash his clothes and be clean. 7 But if the scab should at all spread over the skin, after he has been seen by the priest for his cleansing, he shall be seen by the priest again. 8 And if the priest sees that the scab has indeed spread on the skin, then the priest shall pronounce him unclean. It is leprosy.