27 I have set you for a tester and a fortress among my people, that you may know and test their way.
28 They are all grievous revolters, walking with slanders: they are bronze and iron; they are all corrupters.
29 The bellows blow fiercely, the lead is consumed by the fire; the smelter refines in vain: for the wicked are not removed.
30 Rejected silver shall men call them, because the LORD has rejected them.