This verse is omitted in the Septuagint, and (unless the existence of later insertions is denied altogether) is all but certainly due to a later hand (comp. Jeremiah 7:23). Comp. on Jeremiah 30:10,Jeremiah 30:11.
These verses occur in a form evidently more original in Jeremiah 23:19, Jeremiah 23:20. In all probability they were first inserted from memory in the margin, and then incorporated into the text at a time subsequent (how long subsequent we cannot say) to Jeremiah.
HOMILETICS