Jeremiah
Jeremiah 6:29ESV·traditional attribution

The bellows blow fiercely; the lead is consumed by the fire; in vain the refining goes on, for the wicked are not removed.

John Calvin Reformed @genevareformer

He says, that the bellows was consumed by the fire and without any advantage. The whole sentence is metaphorical. Interpreters refer it simply to what was taught; and hence they consider the mouth of the Prophet to be the bellows, by which the fire was kindled.

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

The bellows are burnt,.... Which Kimchi interprets of the mouth and throat of the prophet, which, through reproving the people, were dried up, and become raucous and hoarse, and without any profit to them; and so the Targum, "lo, as the refiner's blower, that is burnt in the midst of the fire, so the voice of the prophets is silent, who prophesied to them, turn...