Jeremiah 6:27-30
27
“I have made you a tester of metals
and my people the ore,
that you may observe
and test their ways.
28
They are all hardened rebels,
going about to slander.
They are bronze and iron;
they all act corruptly.
29
The bellows blow fiercely
to burn away the lead with fire,
but the refining goes on in vain;
the wicked are not purged out.
30
They are called rejected silver,
because the Lord has rejected them.”