Charles Ellicott Commentary Jeremiah 27:3

"and send them to the king of Edom, and to the king of Moab, and to the king of the children of Ammon, and to the king of Tyre, and to the king of Sidon, by the hand of the messengers that come to Jerusalem unto Zedekiah king of Judah;" — Jeremiah 27:3 (ASV)

And send them to the king of Edom. — The princes who are named had, as the context shows, sent their ambassadors to Zedekiah, proposing an alliance against Nebuchadnezzar. They are named in the same order as in the prophecy of Jeremiah 25:21-22, which had been delivered fifteen years before.

The prophecy then delivered had been partly fulfilled, but these princes were still struggling against it, apparently encouraged by the difficulties which in Media and elsewhere seemed to delay the complete triumph of the Chaldean king. The prophet is commissioned to tell all of them alike that their efforts are in vain, and that the supremacy of Babylon was, for the time being, part of God’s order, for the chastisement of the nations. In Jeremiah 49:0 we have a fuller, and probably later, development of the same strain of prediction.