Leviticus 13:53-55

53“But if the priest examines it and finds that the contaminated area has not spread in the clothing, the fabric, or the leather,

54the priest will order the object to be washed and then quarantined for seven more days.

55Then the priest must examine the object again. If he finds that the contaminated area has not changed color after being washed, even if it did not spread, the object is defiled. It must be completely burned up, whether the contaminated spot is on the inside or outside.