1. For the Conductor, by David, a psalm. O God of my praise, be not silent.
2. For the mouth of the wicked and the mouth of the deceitful have opened against me; they spoke to me with a false tongue.
3. They have surrounded me with words of hate, and attacked me without cause.
4. In return for my love they hate me; still, I am [a man of] prayer.
5. They placed harm upon me in return for my favor, and hatred in return for my love.

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. Appoint a wicked man over him; let an adversary stand at his right.
7. When he is judged may he go out condemned; may his prayer be considered a sin.
8. May his days be few; may another take his position.
9. May his children be orphans and his wife a widow.
10. May his children wander about and beg; may they seek charity from amid their ruins.
11. May the creditor seize all that he has, and may strangers plunder [the fruits of] his labor.
12. May he have none who extends him kindness, and may none be gracious to his orphans.
13. May his posterity be cut off; may their name be erased in a later generation.
14. May the iniquity of his fathers be remembered by the Lord, and the sin of his mother not be erased.
15. May they be before the Lord always, and may He cut off their memory from the earth.
16. Because he did not remember to do kindness, and he pursued the poor and destitute man and the broken-hearted, to kill [him].
17. He loved the curse and it has come upon him; he did not desire blessing, and it has remained far from him.
18. He donned the curse like his garment, and it came like water into his innards, like oil into his bones.
19. May it be to him like a cloak in which he wraps himself, as a belt with which he girds himself always.
20. This is from the Lord for the deeds of my enemies, and [for] those who speak evil against my soul.
21. And You, God, my Lord, do [kindness] with me for the sake of Your Name; for Your kindness is good, rescue me!
22. For I am poor and destitute, and my heart has died within me.
23. Like the fleeting shadow I am banished, I am tossed about like the locust.
24. My knees totter from fasting, and my flesh is lean without fat.
25. And I became a disgrace to them; they see me and shake their heads.
26. Help me, Lord, my God, deliver me according to Your kindness.
27. Let them know that this is Your hand, that You, Lord, have done it.
28. Let them curse, but You will bless; they arose, but they will be shamed, and Your servant will rejoice.
29. May my adversaries be clothed in humiliation; may they wrap themselves in their shame as in a cloak.
30. I will thank the Lord profusely with my mouth, and amid the multitude I will praise Him,
31. when He stands at the right of the destitute one to deliver him from the condemners of his soul.