1. A song, a psalm by the sons of Korach, for the Conductor, upon the machalat le'anot; 1 a maskil2 for Heiman the Ezrachite.
2. O Lord, God of my deliverance, by day I cried out [to You], by night I [offer my prayer] before You.
3. Let my prayer come before You; turn Your ear to my supplication.
4. For my soul is sated with affliction, and my life has reached the grave.
5. I was reckoned with those who go down to the pit, I was like a man without strength.

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. [I am regarded] among the dead who are free, like corpses lying in the grave, of whom You are not yet mindful, who are yet cut off by Your hand.
7. You have put me into the lowest pit, into the darkest places, into the depths.
8. Your wrath has weighed heavily upon me, and all the waves [of Your fury] have constantly afflicted me.
9. You have estranged my friends from me, You have made me abhorrent to them; I am imprisoned and unable to leave.
10. My eye is afflicted because of distress; I call to You, O Lord, every day; I have stretched out my hands [in prayer] to You.
11. Do You perform wonders for the deceased? Do the dead stand to offer You praise? Selah.
12. Is Your kindness recounted in the grave, Your faithfulness in the place of perdition?
13. Are Your wondrous deeds known in the darkness [of the grave], or Your righteousness in the land of oblivion?
14. But, I, to You, O Lord, I cry; each morning my prayer comes before You.
15. Why, O Lord, do You forsake my soul? Why do You conceal Your countenance from Me?
16. From my youth I have been afflicted and approaching death, yet I have borne the fear of You which is firmly established within me.
17. Your furies have passed over me; Your terrors have cut me down.
18. They have engulfed me like water all day long, they all together surrounded me.
19. You have estranged from me beloved and friend; I have been rejected by my intimates.