John Gill Commentary Jeremiah 5:18

"But even in those days, saith Jehovah, I will not make a full end with you." — Jeremiah 5:18 (ASV)

Nevertheless, in those days When these things should be done by the king of Babylon and his army: says the Lord, I will not make a full end with you : this was to be done at another time, not now; (See Gill on Jeremiah 4:27), (See Gill on Jeremiah 5:10), though some think that this is a threatening of more and greater calamities; that this would not be all he would do to them; he had not yet done; he had other evils and calamities, to bring upon them, particularly a long captivity.