Jeremiah
Jeremiah 6:28ESV·traditional attribution

They are all stubbornly rebellious, going about with slanders; they are bronze and iron; all of them act corruptly.

John Calvin Reformed @genevareformer

The Prophet now shews what he found the Jews to be, whose manners and proceedings he had been commanded to observe. Had he said this at first, either the fury of the people would have been kindled, or his judgment would have been treated with contempt: but when God shewed what he had known through his servant, it had more weight, and then the fury...

Matthew Henry Presbyterian @wholebiblehenry

Here, I. God appeals to all the neighbours, nay, to the whole world, concerning the equity of his proceedings against Judah and Jerusalem (Jer 6:18, Jer 6:19): "Hear, you nations, and know particularly, O congregation of the mighty, the great men of the nations, that take cognizance of the affairs of states about you and make remarks upon them.

Commenting on Jeremiah 6:18-30

John Gill Reformed Baptist @doctorgill

They are all grievous revolters,.... From the right way of God and his worship: or, they are all revolters of revolters (e); of all, the greatest revolters, the greatest sinners and transgressors, the most stubborn and disobedient; or sons of revolters; fathers and children are alike.