'Rust' in the Bible

Therefore thus saith the Lord Jehovah: Woe to the bloody city, to the pot whose rust is therein, and whose rust is not gone out of it! Bring it out piece by piece; let no lot fall upon it:

Then set it empty upon its coals, that it may be hot, and the brass of it may burn, and that its filthiness may be molten in it, and that its rust may be consumed.

She hath exhausted her labours, yet her great rust goeth not forth out of her: let her rust be in the fire.

Lay not up for yourselves treasures upon the earth, where moth and rust spoils, and where thieves dig through and steal;

but lay up for yourselves treasures in heaven, where neither moth nor rust spoils, and where thieves do not dig through nor steal;