Leviticus 13:55-57

New International Version

⁵⁵ After the article has been washed, the priest is to examine it again, and if the mold has not changed its appearance, even though it has not spread, it is unclean. Burn it, no matter which side of the fabric has been spoiled. ⁵⁶ If, when the priest examines it, the mold has faded after the article has been washed, he is to tear the spoiled part out of the fabric, the leather, or the woven or knitted material. ⁵⁷ But if it reappears in the fabric, in the woven or knitted material, or in the leather article, it is a spreading mold; whatever has the mold must be burned.