Charles Ellicott Commentary Jeremiah 46:1

"The word of Jehovah which came to Jeremiah the prophet concerning the nations." — Jeremiah 46:1 (ASV)

The word of the Lord ... —We find here something like the traces of a plan in the arrangement of Jeremiah’s prophecies. Those that were concerned exclusively with the surrounding pagan nations were collected together, and attached as an appendix to those which were addressed directly to his own people. Most of those that follow were connected historically with Jeremiah 25:15-26, and may be regarded as the development of what is given there in outline, and belong accordingly to the reign of Jehoiakim (circ. B.C. 607).