The prophets setting forth the kingdom of God in Zion, exhorteth all, by the example of their forefathers, to worship God at his holy hill.
This psalm also is attributed to David by the LXX, and most other ancient versions. It seems to relate to his quiet establishment on his throne. The Syriac title tells us, that it treats primarily of the slaughter of the Midianites, and that in its secondary sense it is a prediction of the glory of Christ's kingdom.
Psalms 99:1. Let the people tremble— The literal sense seems to be, "God hath now established David on the throne, and settled the kingdom upon him, notwithstanding all the seditions or tumults of rebels, or other adversaries." The other expression is to the same sense: Let the earth be moved; i.e. this hath been accomplished, notwithstanding all the commotions and uproars of the people of the earth. Mudge renders both the clauses in the future: The people shall tremble;—the earth shall be moved.