Leviticus 13:54-56

⁵⁴Then the priest shall direct, and they shall wash that wherein is the plague, and he shall shut it up a second seven days.

⁵⁵And the priest shall look after that they have washed the plague, and, behold, if (the state of) the plague hath not increased, it is (nevertheless) unclean; thou shalt burn it with fire, it is a fretting leprosy, whether in its smoothness or its roughness (i.e., its right or wrong side).

⁵⁶And if the priest look, and, behold, the plague hath become obscure after they have washed it, he shall tear it out of the garment, or out of the skin, or out of the warp, or of the woof.