Leviticus 13:58-59

Good News Translation

⁵⁸ If he washes the object and the spot disappears, he shall wash it again, and it will be ritually clean.

⁵⁹ This, then, is the law about mildew on clothing, whether it is wool or linen, or on linen or wool cloth or on anything made of leather; this is how the decision is made as to whether it is ritually clean or unclean.