Contaminated

If any fabric is contaminated with mildew—any wool or linen garment,

…and if the mark in the fabric, leather, weave, knit, or leather article is green or red, then it is contaminated with mildew and must be shown to the priest.

And the priest is to examine the mildew and isolate the contaminated fabric for seven days.

He is to burn the fabric, weave, or knit, whether the contaminated item is wool or linen or leather. Since the mildew is harmful, the article must be burned up.

…the priest is to order the contaminated article to be washed and isolated for another seven days.

If the priest examines it and the mildew has faded after it has been washed, he must cut the contaminated section out of the fabric, leather, weave, or knit.

But if it reappears in the fabric, weave, or knit, or on any leather article, it is spreading. You must burn the contaminated article.

…he must order that the contaminated stones be pulled out and thrown into an unclean place outside the city.

So different stones must be obtained to replace the contaminated ones, as well as additional mortar to replaster the house.

You are therefore to distinguish between clean and unclean animals and birds. Do not become contaminated by any animal or bird, or by anything that crawls on the ground; I have set these apart as unclean for you.