Albert Barnes Commentary Jeremiah 49:39

"But it shall come to pass in the latter days, that I will bring back the captivity of Elam, saith Jehovah." — Jeremiah 49:39 (ASV)

Elam - Elam was subject to Babylon (Daniel 8:2), and its capital Shushan a favorite residence of the Persian kings (Esther 1:2). Of its subsequent fate we know little; the Elamites continued to exist, and members of their nation were present at Pentecost among those chosen to represent the Gentile world at the first preaching of the Gospel (Acts 2:9).