Leviticus 13:47-59 - Regulations About Contaminated Fabrics
47 When there is mildew on clothing, whether wool or linen, 48 or on any woven piece of linen or wool cloth or on leather or anything made of leather, 49 if it is greenish or reddish, it is a spreading mildew and must be shown to the priest. 50 The priest shall examine it and put the object away for seven days. 51 He will examine it again on the seventh day. If the mildew has spread, the object is unclean. 52 The priest will burn it, because it is a spreading mildew. It must be destroyed by fire.
53 If the priest finds that the mildew has not spread on the object, 54 he will order that it be washed and put away for another seven days. 55 He shall examine it again and if the mildew has not changed color, even though it has not spread, it is still unclean. You must burn the object, whether the rot is on the front or the back.
56 When the priest examines it again, the mildew has faded; he will tear it out of the clothing or leather. 57 Then if the mildew reappears, it is spreading again, and the owner must burn the object. 58 If he washes the object and the spot disappears, he should wash it again. It will be ritually clean.
59 This is the law about mildew on clothing. Whether it is wool or linen, or on linen or wool cloth or on anything made of leather; this is how the decision is made as to whether it is ritually clean or unclean.