But they shall serve the LORD their God, and {g} David their king, whom I will raise up to them.

(g) That is, Messiah who would come of the stock of David according to the flesh and would be the true pastor, Eze 34:23 who is set forth and his kingdom would be everlasting in the person of David, Ho 3:5.

Wesley's Notes

30:9 But - Either this must be understood of the kingdom of Christ, under which the Jews that received him were made spiritually free: or there is a time yet to come, when this ancient people of God shall be restored to a farther civil liberty than they have enjoyed ever since the captivity of Babylon.

Jamieson-Fausset-Brown Bible Commentary

9. Instead of serving strangers (Jer 30:8), they shall serve the Lord, their rightful King in the theocracy (Eze 21:27).

David, their king-No king of David's seed has held the scepter since the captivity; for Zerubbabel, though of David's line, never claimed the title of "king." The Son of David, Messiah, must therefore be meant; so the Targum (compare Isa 55:3, 4; Eze 34:23, 24; 37:24; Ho 3:5; Ro 11:25-32). He was appointed to the throne of David (Isa 9:7; Lu 1:32). He is here joined with Jehovah as claiming equal allegiance. God is our "King," only when we are subject to Christ; God rules us not immediately, but through His Son (Joh 5:22, 23, 27).

raise up-applied to the judges whom God raised up as deliverers of Israel out of the hand of its oppressors (Jud 2:16; 3:9). So Christ was raised up as the antitypical Deliverer (Ps 2:6; Lu 1:69; Ac 2:30; 13:23).

Matthew Henry's Concise Commentary

30:1-11 Jeremiah is to write what God had spoken to him. The very words are such as the Holy Ghost teaches. These are the words God ordered to be written; and promises written by his order, are truly his word. He must write a description of the trouble the people were now in, and were likely to be in. A happy end should be put to these calamities. Though the afflictions of the church may last long, they shall not last always. The Jews shall be restored again. They shall obey, or hearken to the Messiah, the Christ, the Son of David, their King. The deliverance of the Jews from Babylon, is pointed out in the prophecy, but the restoration and happy state of Israel and Judah, when converted to Christ their King, are foretold; also the miseries of the nations before the coming of Christ. All men must honour the Son as they honour the Father, and come into the service and worship of God by him. Our gracious Lord pardons the sins of the believer, and breaks off the yoke of sin and Satan, that he may serve God without fear, in righteousness and true holiness before him all the remainder of his days, as the redeemed subject of Christ our King.