the priest shall command them to wash the article in which the disease appears, and he shall put it aside seven days more.
The priest shall examine the diseased article after it has been washed. If the diseased spot has not changed color, though the disease has not spread, it is unclean; you shall burn it in fire, whether the leprous spot is on the inside or on the outside.
References for Leviticus 13:55
If the priest makes an examination, and the disease has abated after it is washed, he shall tear the spot out of the cloth, in warp or woof, or out of skin.
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 the disease appears.
But the cloth, warp or woof, or anything of skin from which the disease disappears when you have washed it, shall then be washed a second time, and it shall be clean.
This is the ritual for a leprous disease in a cloth of wool or linen, either in warp or woof, or in anything of skin, to decide whether it is clean or unclean.
References for Leviticus 13:59