Leviticus 13:58-59

And the garment, either the warp, or the woof, or whatsoever thing of skin it be, which thou shalt wash, if the plague be departed from them, then it shall be washed the second time, and shall be clean. This is the law of the plague of leprosy in a garment of woollen or linen, either in the warp, or the woof, or anything of skin, to pronounce it clean, or to pronounce it unclean.