Leviticus 13:55-57

Revised Standard Version

⁵⁵ and the priest shall examine the diseased thing after it has been washed. And if the diseased spot has not changed color, though the disease has not spread, it is unclean; you shall burn it in the fire, whether the leprous spot is on the back or on the front.

⁵⁶ “But if the priest examines, and the disease is dim after it is washed, he shall tear the spot out of the garment or the skin or the warp or woof; ⁵⁷ then if it appears again in the garment, in warp or woof, or in anything of skin, it is spreading; you shall burn with fire that in which is the disease.