Albert Barnes 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)

Come – Or, have come. The ambassadors of these five kings had probably come to Jerusalem to consult about forming a league to throw off the Babylonian supremacy. The attempt failed.