For brass I will bring gold, and for iron I will bring silver, and for wood brass, and for stones iron: I will also make thy officers peace, and thine exactors righteousness.
For brass I will bring gold - Poetically, with figurative allusion to the furniture of the temple; all things in that happy age to come shall be changed for the better.
I will also make ... thine exactors - namely, of tribute.
Righteousness. All rulers in restored Jerusalem shall not only be peaceable and righteous, but shall be, as it were, "peace" and "righteousness" itself in their administration.