Leviticus 13:55-57

Amplified Bible

⁵⁵ The priest shall examine the article with the mark after it has been washed, and if the mark has not changed color, even though the mark has not spread, it is unclean; you shall burn it in the fire; it is a corroding mildew, whether on the top or on the front of it.

⁵⁶ “If the priest looks and the mark has faded after it is washed, he shall tear it out of the garment, or the leather, or out of the warp or woof. ⁵⁷ If it still appears in the garment, either in the warp or in the woof, or on anything made of leather, it is an outbreak; you shall burn the marked part in the fire.