Leviticus 13:58-59

But the garment, or the warp or the woof, or any article made of skin from which the disease departs when you have washed it, shall then be washed a second time, and be clean.” This is the law for a case of leprous disease in a garment of wool or linen, either in the warp or the woof, or in any article made of skin, to determine whether it is clean or unclean.