Now listen, you rich people, weep and wail because of the misery that is coming upon you. Your wealth has rotted, and moths have eaten your clothes. Your gold and silver are corroded. Their corrosion will testify against you and eat your flesh like fire. You have hoarded wealth in the last days. James 5:1-3
“The rich must repent while there is still time for them to do so. James is speaking here of those rich people who have shown themselves to be too stingy to offer any help to the poor…It is true of course that gold does not rust, but James is comparing it to material things which do rust in the course of time.”
Hilary of Arles (c. 401-449) in Tractate on the Letter of James. PL Supp. 3:80.