1. A song of ascents. I lift my eyes to the mountains-from where will my help come?
2. My help will come from the Lord, Maker of heaven and earth.
3. He will not let your foot falter; your guardian does not slumber.
4. Indeed, the Guardian of Israel neither slumbers nor sleeps.
5. The Lord is your guardian; the Lord is your protective shade at your right hand.

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 sun will not harm you by day, nor the moon by night.
7. The Lord will guard you from all evil; He will guard your soul.
8. The Lord will guard your going and your coming from now and for all time.