Leviticus 13:57-59

57But if it appears again in the garment, either in the weaving, the texture, or in anything made of leather, it is spreading. You are to burn with fire whatever has the mark.

58The garment, or weaving, or texture, or whatever leather item it is that you have washed, if the mark has departed from it, is to be washed a second time, and will become clean.”

59This is the Torah for a mark of tza'arat in a garment of wool or linen, either in the weaving, the texture, or in anything of leather, to pronounce it clean or to pronounce it unclean.