Adam Clarke's Commentary on the Bible - Psalms 149:1
Sing unto the Lord a new song - That is, as we have often had occasion to remark, an excellent song, the best we can possibly pronounce. So the word חדש chadash is often understood; and so the word novus, "new," was often used among the Latin writers: - Pollio amat nostram, quamvis sit rustica, musam. Pollio et ipse facit read more
John Gills Exposition of the Bible Commentary - Psalms 149:9
To execute upon them the judgment written ,.... In the law, according to the Targum; either upon the seven nations of the land of Canaan, Deuteronomy 7:12 ; or upon all the enemies of God and his people, Deuteronomy 32:41 ; or rather in the Gospel; which declares, that whoever believes in Christ shall be saved, but whoever believes not shall be damned, Mark 16:16 . And according to this twoedged sword or word of God, and the sentence pronounced by it, and judgment written in it, things... read more