For all their cruelties and injuries towards God's people. This was literally accomplished by David upon the Philistines, Ammonites, Syrians, and other neighbouring nations and princes, which were bitter enemies to God's people. And the same thing was done afterward in the Christian world, when God raised up Christian princes, who did by the help of the Christians, fighting with and under them, severely revenge the blood of the martyred Christians upon their cruel persecutors and tyrants in divers ages. It may also be understood of the spiritual plagues which Christ by the hand or ministry of his apostles and ministers did inflict upon the hearts and consciences of his incorrigible enemies, who by God's word and ordinances were either tormented or hardened to their destruction. Yea, it may have a respect unto the last day of judgment, in which the saints shall judge the world, 1 Corinthians 6:2, which will be a most dreadful execution of this vengeance, &c.
Related Commentaries of Psalms 149:7
Psalms 149:7
7 To execute vengeance upon the heathen, and punishments upon the people;