This is what the LORD of Hosts says: “Behold, I will shatter Elam’s bow, the mainstay of their might.
Then God, in the first place, declares that he would break the bow of Elam The Parthians and other Orientals, we know, were very skillful archers; for every nation possesses its own peculiar excellency in connection with war. Some excel in the use of one kind of weapons, and others in the use of another kind.
This prophecy is dated in the beginning of Zedekiah's reign; it is probable that the other prophecies against the Gentiles, going before, were at the same time. The Elamites were the Persians, descended from Elam the son of Shem (Gen 10:22); yet some think it was only that part of Persia which lay nearest to the Jews which was called Elymais, and adjoined to Media-Elam...
Commenting on Jeremiah 49:34-39
Thus saith the Lord of hosts, I will break the bow of Elam,.... The inhabitants of this country were famous for their skill in archery; See Gill on Isa 22:6; this the Lord threatens to break, so that it, should be useless, and of no more service to them to defend themselves, or annoy others.