Leviticus 13:50-59

⁵⁰The priest must inspect the mold and place the item in isolation for seven days.

⁵¹On the seventh day the priest shall inspect it again, and if the patch of mold has spread in the material, whether it's leather, woven, or knitted or some other leather item, then it is a harmful mold; the article is unclean, whatever it is being used for.

⁵²The priest is to burn it, whether the affected item is wool or linen or leather. Because the mold is harmful, the article must be burned.

⁵³However, if when the priest inspects it again it, the patch mold has not spread,

⁵⁴the priest shall order that the affected item is washed and placed in isolation for another seven days.

⁵⁵Once it has been washed, the priest is to inspect again it, and if the item with the mold hasn't changed how it looks, it is unclean. Though the mold hasn't spread, you must burn the item, whether the mold damage is on the inside or the outside.

⁵⁶If the priest inspects it and the patch of mold has faded after it has been washed, he is to cut out the affected part the material, whether it's leather, woven, or knitted.

⁵⁷However, if the mold comes back then it is spreading. In that case you must burn the affected item.

⁵⁸If the mold disappears after washing, then have it washed again, and it will be clean.

⁵⁹These are the regulations regarding what needs to be done when mold contaminates wool or linen material, whether woven or knitted, or any leather item, as to declaring it clean or unclean.”