Albert Barnes Commentary Jeremiah 50:8

"Flee out of the midst of Babylon, and go forth out of the land of the Chaldeans, and be as the he-goats before the flocks." — Jeremiah 50:8 (ASV)

So firmly did the Jews settle themselves in Babylon under Jeremiah’s counsel, that they were the last to abandon the place.

He goats - See Isaiah 14:9 note.