Jeremiah 6:28-30

Amplified Bible

²⁸ 
They are all the worst [kind] of [stiff-necked, godless] rebels,
Going around spreading slander.
They are [not gold and silver ore, but] bronze and iron;
They are all corrupt.
²⁹ 
The bellows blow fiercely,
The lead is consumed by the fire;
In vain they continue refining,
But the wicked are not separated and removed.
³⁰ 
They call them rejected silver [only dross, without value],
Because the Lord has rejected them.