Jeremiah 6:27-30 NIV

27 “I have made you a tester of metals and my people the ore, that you may observe and test their ways.

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28 They are all hardened rebels, going about to slander. They are bronze and iron; they all act corruptly.

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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.

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30 They are called rejected silver, because the LORD has rejected them.”

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