Leviticus 13:54-56

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

⁵⁵Then 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.

⁵⁶If 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;