Leviticus 13:53-59

“But if the priest shall look, and indeed the mark has not spread in the garment, either in the warp or in the woof, or in any article of leather, then the priest shall order them to wash the thing in which the mark occurs and he shall quarantine it for seven more days. After the article with the mark has been washed, the priest shall again look, and if the mark has not changed its appearance, even though the mark has not spread, it is unclean; you shall burn it in the fire, whether an eating away has produced bareness on the top or on the front of it. “Then if the priest looks, and if the mark has faded after it has been washed, then he shall tear it out of the garment or out of the leather, whether from the warp or from the woof; and if it appears again in the garment, whether in the warp or in the woof, or in any article of leather, it is an outbreak; the article with the mark shall be burned in the fire. The garment, whether the warp or the woof, or any article of leather from which the mark has departed when you washed it, it shall then be washed a second time and will be clean.” This is the law for the mark of leprosy in a garment of wool or linen, whether in the warp or in the woof, or in any article of leather, for pronouncing it clean or unclean.