Leviticus 13:2-8

2When a man shall have in the skin of his flesh a rising or a scab, or bright spot, and it become in the skin of his flesh a sore [as] of leprosy, then he shall be brought unto Aaron the priest, or unto one of his sons the priests.

3And when the priest looketh on the sore in the skin of the flesh, and the hair in the sore is turned white, and the sore looketh deeper than the skin of his flesh, it is the sore of leprosy; and the priest shall look on him and pronounce him unclean.

4But if the bright spot be white in the skin of his flesh, and look not deeper than the skin, and the hair thereof be not turned white, the priest shall shut up [him that hath] the sore seven days.

5And the priest shall look on him the seventh day; and behold, in his sight, the sore remaineth as it was, the sore hath not spread in the skin, then the priest shall shut him up seven days a second time.

6And the priest shall look on him again the seventh day, and behold, the sore is become pale and the sore hath not spread in the skin, then the priest shall pronounce him clean; it is a scab; and he shall wash his garments and be clean.

7But if the scab have spread much in the skin, after that he hath been seen by the priest for his cleansing, he shall be seen by the priest again;

8and the priest shall look on him, and behold, the scab hath spread in the skin; then the priest shall pronounce him unclean: it is leprosy.