John Gill Commentary Jeremiah 6:18

"Therefore hear, ye nations, and know, O congregation, what is among them." — Jeremiah 6:18 (ASV)

Therefore hear, you nations

Since the Jews refused to hearken to the word of the Lord, the Gentiles are called upon to hear it, as in (Acts 13:45Acts 13:46); this is a rebuke to the Jews, that the Gentiles would hear, when they would not.

and know, O congregation

either of Israel, as the Targum and Kimchi explain it; or of the nations of the world, the multitude of them; or the church of God in the midst of them.

what is among them

among the Jews: either what evil is among them; what sins and transgressions are committed by them; which were the cause of the Lord's threatening them with sore judgments, and bringing them upon them; so Jarchi and Kimchi interpret the words; to which agrees the Targum, "and let the congregation of Israel know their sins;" or the punishments the Lord inflicted on them: so the Vulgate Latin version, "and know, O congregation, what I will do unto them"; which sense is confirmed by what follows: