John Gill Commentary Jeremiah 50:34

"Their Redeemer is strong; Jehovah of hosts is his name: he will thoroughly plead their cause, that he may give rest to the earth, and disquiet the inhabitants of Babylon." — Jeremiah 50:34 (ASV)

Their Redeemer [is] strong, the Lord of hosts [is] his name, &c.] And seeing his name is the Lord of hosts or armies, and has all the armies of heaven and earth at his command; and especially since he is Jehovah, the everlasting and unchangeable I AM; he must be strong and mighty, yes, the Almighty, and so able to redeem his Israel, as the Messiah was, who is here intended; from sin, Satan, and the world; from the law, its curse and condemnation; from death and hell, and wrath to come; as well as to deliver his people from the Romish yoke, and to avenge them on all their enemies:

he shall thoroughly plead their cause; with God and man; he that is the Redeemer of men is their advocate with the Father; with whom he pleads on their behalf his blood, righteousness and sacrifice, for all blessings of grace and glory; and to all charges of law and justice, and their own hearts, and the condemnings of them; and he pleads their cause with men, and rights their wrongs, and avenges the injuries done them by antichrist and others, (Revelation 19:2);

that he may give rest to the land; not to the land of Judea only, but to the whole world; which will be at rest and in peace upon the destruction of mystical Babylon, and the conversion of the Jews, and their return to their own land; as well as the Messiah will give spiritual rest to all the redeemed ones here, and eternal rest, which remains for the people of God, hereafter:

and disquiet the inhabitants of Babylon; by the destruction of it and them; and rendering tribulation to them that trouble his people; and by punishing antichrist with the vials of his wrath, and with everlasting damnation, the smoke of whose torment shall ascend for ever and ever, (2 Thessalonians 1:6 2 Thessalonians 1:7 2 Thessalonians 1:9) (Revelation 14:11) (Revelation 16:9–11Revelation 16:21) .