Jeremiah 27:7

7All nations must serve him and his son and grandson
This is a figure that emphasizes that they will serve for a long time but not for an unlimited duration. The kingdom of Babylon lasted a relatively short time by ancient standards. It lasted from 605 b.c. when Nebuchadnezzar defeated Necho at Carchemish until the fall of Babylon in 538 b.c. There were only four rulers. Nebuchadnezzar was succeeded by his son, Evil Merodach (cf. 52:31), and two other rulers who were not descended from him.
until the time comes for his own nation to fall.
Heb “until the time of his land, even his, comes.” The independent pronoun is placed here for emphasis on the possessive pronoun. The word “time” is used by substitution for the things that are done in it (compare in the NT John 2:4; 7:30; 8:20 “his hour had not yet come”).
Then many nations and great kings will in turn subjugate Babylon.
Heb “him.” This is a good example of the figure of substitution where the person is put for his descendants or the nation or subject he rules. (See Gen 28:13–14 for another good example and Acts 22:7 in the NT.)
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