Jeremiah 6:27-29

Young's Literal Translation

²⁷ A watch-tower I have given thee, Among My people a fortress, And thou knowest, and hast tried their way.

²⁸ All of them are turned aside by apostates, Walking slanderously -- brass and iron, All of them are corrupters.

²⁹ The bellows have been burnt, By fire hath the lead been consumed, In vain hath a refiner refined, And the wicked have not been drawn away.