Leviticus 13:55-57
English Standard Version
56"But if the priest examines, and if the diseased area has faded after it has been washed, he shall tear it out of the garment or the skin or the warp or the woof.
57Then if it appears again in the garment, in the warp or the woof, or in any article made of skin, it is spreading. You shall burn with fire whatever has the disease.