Jeremiah 6:27-29

New International Version

²⁷ “I have made you a tester^(A) of metals
    and my people the ore,
that you may observe
    and test their ways.
²⁸ They are all hardened rebels,^(B)
    going about to slander.^(C)
They are bronze and iron;^(D)
    they all act corruptly.
²⁹ The bellows blow fiercely
    to burn away the lead with fire,
but the refining^(E) goes on in vain;
    the wicked are not purged out.