John Trapp on Psalms 149:9

Verſ. 9 To execute upon them the Judgement written] The Jews thought they might kill any Idolaters; and now to kill a Chriſtian is counted by them a meritorious work. The wicked are apt to exceed their commiſſion, Zech. 1.15. So may the Saints. David was too cruel to the Ammonites, 2 Sam. 11. Theodoſius to the Theſſalonians. Here therefore they are limited to the word written.

This honour have all his Saints] As having obtained like precious faith, 2 Pet. 1.1.