Adam Clarke on Jeremiah 46:1

The word of the Lord - against the Gentiles - This is a general title to the following collection of prophecies, written concerning different nations, which had less or more connection with the Jews, either as enemies, neighbors, or allies.

They were not written at the same time; and though some of them bear dates, yet it would be difficult to give them any chronological arrangement. Dahler's mode of ascertaining the times of their delivery may be seen in the table in the introduction.