1. Praise the Lord! Sing to the Lord a new song, [recount] His praise in the assembly of the pious.
2. Israel will rejoice in its Maker; the children of Zion will delight in their King.
3. They will praise His Name with dancing; they will sing to Him with the drum and harp.
4. For the Lord desires His people; He will adorn the humble with salvation.
5. The pious will exult in glory; they will sing upon their beds.

Tehillim Ohel Yoseph Yitzchok (Kehot Publication Society)

Tehillim is recited by Jewish people collectively and individually, as the desire occurs to offer praise and thanksgiving to G-d; or alternitavely, in times of crisis and need, as a form of supplication, and even as a venue to express regret for sin.

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6. The exaltation of God is in their throat, and a double-edged sword in their hand,
7. to bring retribution upon the nations, punishment upon the peoples;
8. to bind their kings with chains, and their nobles with iron fetters;
9. to execute upon them the prescribed judgment; it shall be a glory for all His pious ones. Praise the Lord!