Charles Ellicott Commentary Jeremiah 31:7

"For thus saith Jehovah, Sing with gladness for Jacob, and shout for the chief of the nations: publish ye, praise ye, and say, O Jehovah, save thy people, the remnant of Israel." — Jeremiah 31:7 (ASV)

Shout among the chief of the nations ...— Better, Shout over the head of the nations, i.e., over Israel. It would seem from Amos 6:1 that this was a title specially claimed by the kingdom of the Ten Tribes. (Leviticus 20:24; Leviticus 20:26; Deuteronomy 7:6; Deuteronomy 26:19.)

The prophet, in his vision of the future, calls even on the Gentiles to rejoice in the restoration of the remnant of Israel, and to pray for their prosperity. In “deliver” we have the same verb as in the “Hosanna” of Psalms 118:25, Matthew 21:9. The old bitterness of feeling was to pass away, and Gentile and Israelite were to join together in a chorus of praise and prayer. The thought is the same as that of Isaiah 49:6; Isaiah 60:3.