Regulations About Mildew

If any clothing is contaminated with mildew - any woolen or linen clothing, any woven or knitted material or linen or wool, any leather or anything made of leather - and if the contamination in the clothing, or leather, or woven or knitted material, or any leather article, is greenish or reddish, it is a spreading mildew and must be shown to the priest. The priest is to examine the mildew and isolate the affected article for seven days. On the seventh day he is to examine it, and if the mildew has spread in the clothing, or the woven or knitted material, or the leather, whatever its use, it is a destructive mildew; the article is unclean. He must burn up the clothing, or the woven or knitted material of wool or linen, or any leather article that has contamination in it, because the mildew is destructive; the article must be burned up.

Anyone want to fathom a guess at where I found this interesting quote?