'Rust' in the Bible

“Do not store up for yourselves [material] treasures on earth, where moth and rust destroy, and where thieves break in and steal.

But store up for yourselves treasures in heaven, where neither moth nor rust destroys, and where thieves do not break in and steal;

Your gold and silver are corroded, and their corrosion will be a witness against you and will consume your flesh like fire. You have stored up your treasure in the last days [when it will do you no good].