Jeremiah 6:28-30 New American Standard Bible (NASB)

28. All of them are stubbornly rebellious, Going about as a talebearer. They are bronze and iron; They, all of them, are corrupt.

29. The bellows blow fiercely, The lead is consumed by the fire; In vain the refining goes on, But the wicked are not separated.

30. They call them rejected silver, Because the Lord has rejected them.

Jeremiah 6