1. By David, a psalm. The Lord said to my master, "Sit at My right, until I make your enemies a stool for your feet.”
2. The staff of your strength the Lord will send from Zion, to rule amid your enemies.
3. Your people [will come] willingly on the day of your campaign; because of your splendid sanctity from when you emerged from the womb, you still possess the dew of your youth.
4. The Lord has sworn and will not regret: "You shall be a priest forever, just as Melchizedek!”
5. My Lord is at your right; He has crushed kings on the day of His fury.

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.

6. He will render judgement upon the nations, and they will be filled with corpses; He will crush heads over a vast land.
7. He will drink from the stream on the way, and so will hold his head high.