Leviticus 13:53-55

53“If the kohen examines it, and behold, the plague has not spread in the garment, either in the weaving, the texture, or in anything made of leather,

54the kohen shall command that they wash the thing which has the mark, and he is to isolate it seven more days.

55“Then the kohen is to reexamine it, after the mark has been washed, and behold, if the mark has not changed its color and has not spread, it is unclean. You are to burn it in the fire, whether the rot is inside or outside.