Leviticus 13:53-55

53And if the priest shall look, and, behold, the plague be not spread in the garment, either in the warp, or in the woof, or in any thing of skin;

54then the priest shall command that they wash the thing wherein the plague is, and he shall shut it up seven days more:

55and the priest shall look, after that the plague is washed: and, behold, if the plague have not changed its colour, and the plague be not spread, it is unclean; thou shalt burn it in the fire: it is a fret, whether the bareness be within or without.