Jas 5:3. "The rust (ios) of your riches shall be a witness against you" in the judgment, that your riches were of no profit, lying unemployed, and so contracting rust. Mt 6:19-20, "rust" (brosis), "corrosion."
"Don't collect for yourselves treasures on earth, where moth and rust destroy and where thieves break in and steal. But collect for yourselves treasures in heaven, where neither moth nor rust destroys, and where thieves don't break in and steal.
your silver and gold are corroded, and their corrosion will be a witness against you and will eat your flesh like fire. You stored up treasure in the last days!
Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.