Psalm 121
1. A Song of Maalot; I will lift up my eyes to the mountains; From where does my help come:
2. My help comes from the Lord, who made heaven and earth:
3. He will not let your foot be moved; he who watches you will not slumber:
4. Behold, he who watches Israel shall neither slumber nor sleep:
5. The Lord is your keeper; the Lord is your shade upon your right hand:
6. The sun shall not strike you by day, nor the moon by night:
7. The Lord shall preserve you from all evil; he shall preserve your soul:
8. The Lord shall preserve your going out and your coming in from this time forth, and for evermore:
The words in bold are all from the same root: lishmor (shamar): to keep, watch, guard, pay heed to, observe..
Mark 14:37-38 And he cometh, and findeth them sleeping, and saith unto Peter, Simon, sleepest thou? couldest not thou watch one hour? 38 Watch ye and pray, lest ye enter into temptation. The spirit truly is ready, but the flesh is weak.
(One hour = 15 degrees)