Canker with rust

1. James 5: 3
   3 Your ^agold and silver is ^bcankered; and the ^crust of them shall be a witness against you, and shall eat your flesh as it were fire. Ye have heaped treasure together for the last days.
2. Mosiah 8: 11
   11 And again, they have brought swords, the hilts thereof have perished, and the blades thereof were cankered with rust; and there is no one in the land that is able to interpret the language or the engravings that are on the plates. Therefore I said unto thee: Canst thou translate?