Jeremiah 6:28-30

Revised Standard Version

²⁸ They are all stubbornly rebellious,
    going about with slanders;
they are bronze and iron,
    all of them act corruptly.
²⁹ The bellows blow fiercely,
    the lead is consumed by the fire;
in vain the refining goes on,
    for the wicked are not removed.
³⁰ Refuse silver they are called,
    for the Lord has rejected them.”