A new song. — See Psalms 33:3.
The congregation. — Apparently the psalm puts us in the Maccabæan age, when the chasîdîm was become a regular title for the patriotic party.
Related Commentaries of Psalms 149:1
Psalms 149:1
1 Praisea ye the LORD. Sing unto the LORD a new song, and his praise in the congregation of saints.