Here God mitigates the severity of the prediction, because he would at length gather some of the Elamites and restore them, so that they might again obtain some place or honor. He says not in the end of days, but after many days, It shall be in course of time that I will restore the captivity of Elam If it be asked when this was fulfilled, doubtless there has not been a restoration of that nation recorded in history. But the Prophet no doubt gives here a hope to the Elamites, which he gave before to other nations, even that they should be united again under Christ as their head. Though then the Elamites were not afterwards known, yet they have found out that this was not said in vain; nor does the Holy Spirit without reason mention them by the mouth of Luke among others who were converted to Christ. (Acts 2:9.) For though the Elamites were almost unknown, yet he connects them with the Medes and Parthians, "Parthians and Medes and Elamites." This then was the time of which Jeremiah had prophesied, when he said that the Elamites would again be gathered together, that they might not be perpetually captives. And though they might not have then returned into their own country, yet it was a condition far better and more desirable when they obtained a name and a place in the Church than if they had enjoyed every other blessing in the world. And we know that it is said of Christ, that God would gather under his hand all things scattered both in heaven and earth. (Colossians 1:20.) A part of this scattering was God's vengeance on the Elamites. Gathered then have been Elamites with others; and thus God at that time stretched forth in a manner his hand to them through Christ the Mediator, and opened to them the door of hope as to eternal life.

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.

I will bring again the captivity of Elam - As this is to be in the latter days, probably it may mean the spiritual freedom which these people would receive under the Gospel dispensation. Under Cyrus, the Elamites, collected out of all quarters, were united with the Persians, their neighbors, and became, with them, masters of the east. See Calmet and Dahler. There are still, however, difficulties on this subject. Who the Elamites were is still a question. That which appears to be nearest the truth is, that the Elamites and Persians were two distinct people, and continued so till blended together under Cyrus. It is in this light that I have considered the subject in the preceding notes. Neighboring people are frequently confounded in history, and sometimes the name of a people is given to those who have the same character.

But it shall come to pass (k) in the latter days, [that] I will bring again the captives of Elam, saith the LORD.
(k) This may be referred to the empire of the Persians and Medes after the Chaldeans or to the time of Christ, as in (Jeremiah 48:47).

But it shall come to pass in the latter days,.... Not in the times of Cyrus, when these people enjoyed their liberty, as the Jews and other nations did, freed by him from the Babylonian yoke; which cannot with propriety be called the latter days, being but seventy or eighty years at most after this prophecy; but in the times of the Messiah, often in prophecy called the latter days:
that I will bring again the captivity of Elam, saith the Lord: which was accomplished in a spiritual sense, when some of these people, the Elamites, were converted to Christ, and delivered by him from the captivity of sin and Satan, and were brought into the glorious liberty of the children of God; see Acts 2:9.

latter days--The full restoration belongs to gospel times. Elamites were among the first who heard and accepted it (Acts 2:9).
After the predictions of judgment to be inflicted on other nations by Babylon, follows this one against Babylon itself, the longest prophecy, consisting of one hundred verses. The date of utterance was the fourth year of Zedekiah, when Seraiah, to whom it was committed, was sent to Babylon (Jeremiah 51:59-60). The repetitions in it make it likely that it consists of prophecies uttered at different times, now collected by Jeremiah to console the Jews in exile and to vindicate God's ways by exhibiting the final doom of Babylon, the enemy of the people of God, after her long prosperity. The style, imagery, and dialogues prove its genuineness in opposition to those who deny this. It shows his faithfulness; though under obligation to the king of Babylon, he owed a higher one to God, who directed him to prophesy against Babylon.

But - We had the like promise as to Moab, Jeremiah 48:47, and as to Ammon, Jeremiah 49:6, the same latter days either signify after many days, or in the time of the Messiah. In the former sense it may refer to Cyrus, who conquered Persia. In the latter sense it refers to the spiritual liberty which some of these poor Heathens were brought into by the gospel. We read Acts 2:9, that some of the Elamites were at Jerusalem at pentecost, and were some of those converted to Christ.