It was and is the custom of neighbour princes, to send ambassadors into each other's countries to reside there, and maintain correspondence on the behalf of their masters. These nations were neighbours to the Jews, and their princes had their ambassadors resident at Jerusalem. Jeremiah is directed to carry each of these ambassadors a yoke with a bond, as a present from God to their masters; the meaning he is also ordered to tell them in the following words.
Related Commentaries of Jeremiah 27:3
Jeremiah 27:3
3 And send them to the king of Edom, and to the king of Moab, and to the king of the Ammonites, and to the king of Tyrus, and to the king of Zidon, by the hand of the messengers which come to Jerusalem unto Zedekiah king of Judah;