Psalm 121 ESV
Psalm 121: I lift up my eyes to the hills. 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 keeps you will not slumber. 4 Behold, he who keeps Israel will neither slumber nor sleep. 5 The Lord is your keeper; the Lord is your shade on your right hand. 6 The sun shall not strike you by day, nor the moon by night. 7 The Lord will keep you from all evil; he will keep your life. 8 The Lord will keep your going out and your coming in from this time forth and forevermore.
In Psalm 121, we see the psalmist both acknowledge need for divine aid, as well as the certainty one can have in God's ability to preserve us from evil. On what basis can we have that same confidence? It is due to our sure hope that God's aid is strong (vs. 1-2), that he is active and attentive to our needs (vs. 3-4), that he desires to protect us (vs. 5-6), and that he provides us with security (vs. 7-8).