John Gill Commentary Leviticus 13:59

"This is the law of the plague of leprosy in a garment of woollen or linen, either in the warp, or the woof, or anything of skin, to pronounce it clean, or to pronounce it unclean." — Leviticus 13:59 (ASV)

This [is] the law of the plague of leprosy The rules by which it was to be judged of; whether or not it was in a garment of woollen, or linen, either the warp or woof, or any thing of skins; which include everything in which this sort of leprosy was: to pronounce it clean, or to pronounce it unclean; either to declare it free from the plague of the leprosy, or as infected with it, and so accordingly dispose of it.