Jeremiah 6:27-30 - Jeremiah Appointed As An Examiner
27 "I have made you a tester of metals [and] a fortress among my people; that you may know and try their way. 28 They are all grievous rebels, going about with slanders; they are brass and iron: they all of them deal corruptly. 29 The bellows blow fiercely; the lead is consumed of the fire: in vain do they go on refining; for the wicked are not plucked away. 30 Men will call them rejected silver, because Yahweh has rejected them."