Leviticus 13:53-55

53But if the priest look, and behold, the sore hath not spread in the garment, or in the warp, or in the woof, or in anything of skin,

54then the priest shall command that they wash the thing wherein the sore is, and he shall shut it up seven days a second time.

55And the priest shall look on the sore after the washing, and behold, if the sore have not changed its appearance, and the sore have not spread, it is unclean: thou shalt burn it with fire: it is a fretting sore on what is threadbare or where the nap is gone.