Leviticus 13:56-58

New Century Version

⁵⁶ “But when the priest looks at that piece of leather or cloth, the mildew might have faded after the piece has been washed. Then the priest must tear the mildew out of the piece of leather or cloth (either woven or knitted). ⁵⁷ But if the mildew comes back to that piece of leather or cloth (either woven or knitted), the mildew is spreading. And whatever has the mildew must be burned with fire. ⁵⁸ When the cloth (either woven or knitted) or the leather is washed and the mildew is gone, it must be washed again; then it will be clean.