Leviticus 13:53

50 The priest shall examine the plague, and isolate the plague seven days.

51 He shall examine the plague on the seventh day. If the plague has spread in the garment, either in the warp, or in the woof, or in the skin, whatever use the skin is used for, the plague is a destructive mildew. It is unclean.

52 He shall burn the garment, whether the warp or the woof, in wool or in linen, or anything of leather, in which the plague is, for it is a destructive mildew. It shall be burned in the fire.

53 “If the priest examines it, and behold, the plague hasn’t spread in the garment, either in the warp, or in the woof, or in anything of skin;

54 then the priest shall command that they wash the thing that the plague is in, and he shall isolate it seven more days.

55 Then the priest shall examine it, after the plague is washed; and behold, if the plague hasn’t changed its color, and the plague hasn’t spread, it is unclean; you shall burn it in the fire. It is a mildewed spot, whether the bareness is inside or outside.

56 If the priest looks, and behold, the plague has faded after it is washed, then he shall tear it out of the garment, or out of the skin, or out of the warp, or out of the woof;