Riches and Corrosion
The imagery of riches being corroded symbolizes the temporary and ultimately worthless nature of earthly wealth when it is hoarded and not used for God's purposes.
This symbol warns against the dangers of materialism and the false security it provides, emphasizing the need for storing treasures in heaven rather than on earth.
In the ancient world, wealth was often measured in terms of precious metals and garments, both of which could deteriorate over time.