'Rust' in the Bible

Lay not up for yourselves treasures upon the earth, where moth and rust consume, and where thieves break through and steal:

but lay up for yourselves treasures in heaven, where neither moth nor rust doth consume, and where thieves do not break through nor steal:

Your gold and your silver are rusted; and their rust shall be for a testimony against you, and shall eat your flesh as fire. Ye have laid up your treasure in the last days.