Explanatory Notes on the Whole Bible, by John Wesley, [1754-65], at sacred-texts.com
psa 149:4The Lord - He rejoiceth over them to do them good. Beautify - Heb. adorn, make them amiable and honourable in the eyes of the world, who now hate and despise them. The meek - All true Israelites are such.
psa 149:5In glory - For the honour which God putteth upon them. Beds - By night as well as by day.
psa 149:7Vengeance - 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.
psa 149:9Written - Appointed and declared in the holy scripture.