en_tn/lev/13/50.md

anything in which leather is used

AT: "anything in which a person uses the leather" (See: rc://en/ta/man/translate/figs-activepassive)

anything in which the harmful mildew is found

AT: "anything on which the priest found the harmful mildew"

it can lead to disease

The harmful mildew could cause disease in a person who comes in contact with the item.

the item must be completely burned up

AT: "He must burn the item"