Matthew Poole and continuators on Jeremiah 50:4

4 ¶ In those dayes, and in that time, saith the LORD, the children of Israel shall come, they and the children of Judah together, going and weeping : they shall go and seek the LORD their God .

In the dayes wherein God shall begin to execute judgment upon Babylon, which was in the time of Cyrus Emperor of the Medes the children of Iudah shall come out of Captivity and some of the Children of Israel (viz. those of the ten Tribes) hearing that their brethren were gone out of the Captivity of Babylon went also from the several places into which they were disposed by the Assyrians: weeping either for sorrow in the sense of their sins which had brought the miseries of Captivity upon them, or for joy that God ever should shew them such a mercy as to bring them home again into their own Country.

And those that feared God, whether of the Ten Tribes, or of the Kingdom of Iudah, worshipped God at Ierusalem, after their old accustomed manner.