en_tn/lev/14/40.md

in which the mildew has been found

This can be translated in active form. Alternate translation: "in which they found the mildew" (See: rc://en/ta/man/translate/figs-activepassive)

an unclean place

A place that is unfit for people to occupy or to be used for God's purposes is spoken of as if it were physically unclean. (See: rc://en/ta/man/translate/figs-metaphor)