Ezra 2:1

The children of the province That is, of Babylon, for they are here spoken of whom Nebuchadnezzar had brought captive to Babylon, and not those of the ten tribes, who had been dispersed before, by the kings of Assyria, into various provinces; and who afterward returned to Jerusalem in separate companies. Zerubbabel was in the province of Babylon, and to him those captives joined themselves who lived nearest in the same province. This is the reason why those of the tribes of Judah and Benjamin returned first, though a liberty of returning was granted to all the tribes. Another reason is, because the rebuilding of the temple principally concerned them, as Jerusalem was within their dominion. Houbigant. That went out of captivity By the words captivity and captives, when applied to the Jews being carried to Babylon, we are not to understand that they were made slaves to private persons, and bought and sold from one to another, as captives generally were: for they seem to have been transported to Babylon as a colony, to serve the king only. And we do not find that they ever became the property of private persons in Babylon, but lived there free; only subject, as is probable, to some services for the king. Otherwise Cyrus must have redeemed them from the masters, whose property they were, or at least have made a proclamation that every one should let them go free; of neither of which is any mention made. And besides this, when liberty was given to all, of returning to their own land, we find that but few, comparatively speaking, accepted of it, which would scarce have been the case had they been slaves to private persons. Every one unto his city Either those cities and towns which had belonged to their several ancestors; or rather, those which were now allotted to them, and from this time possessed by them. For their former cities were either demolished, or possessed by other persons, whom they were not now in a capacity to disturb.