1.

Praise ye the LORD. Sing unto the LORD a new song, and his praise in the congregation of saints.

The fourth of the concluding five Hallelujah Psalms, answering to NUMBERS. Compare verses: Psalms 149:5-9 with Numbers 24:17-24 .
Praise ye THE LORD. Hebrew Hallelu-JAH. App-4 .
the LORD. Hebrew. Jehovah. App-4 .
congregation = assembly (in its military aspect).
saints = favoured ones, or beloved, Psalms 149:5 .

2.

Let Israel rejoice in him that made him: let the children of Zion be joyful in their King.

Israel. Compare the Structure.
children = sons.
Zion. See App-68 .

3.

Let them praise his name in the dance: let them sing praises unto him with the timbrel and harp.

In the Hebrew this verse is an Introversion : them praise His name. the dance. the drum and harp. them sing praises unto Him.
name. See note on Psalms 20:1 .
timbrel = drum. See note on Exodus 15:20 .

4.

For the LORD taketh pleasure in his people: he will beautify the meek with salvation.

taketh pleasure. Compare Isaiah 54:7 , Isaiah 54:8 .

5.

Let the saints be joyful in glory: let them sing aloud upon their beds.

in glory = "with [ascriptions of] glory".
beds = couches.

6.

Let the high praises of God be in their mouth, and a twoedged sword in their hand;

high praises = extollings.
GOD. Hebrew El. App-4 .

7.

To execute vengeance upon the heathen, and punishments upon the people;

heathen = nations.
people = peoples.

8.

To bind their kings with chains, and their nobles with fetters of iron;

9.

To execute upon them the judgment written: this honour have all his saints. Praise ye the LORD.

the judgment written. See Deuteronomy 32:40-43 . Compare Isaiah 45:14 .Ezekiel 25:14 ; Ezekiel 3 8 and Ezekiel 39 . Zechariah 14 . The special reference is to Numbers 24:17-24 .