He will not let your foot slip.

I lift up my eyes to the mountains— 
where does my help come from? My help comes from the Lord, the Maker of heaven and earth. He will not let your foot slip— 
he who watches over you will not slumber; 
indeed, he who watches over Israel 
will neither slumber nor sleep. The Lord watches over you— 
the Lord is your shade at your right hand;                                                                                                                 
Psalm 121: 1-5

When hard pressed, I cried to the Lord; 
he brought me into a spacious place. The Lord is with me; I will not be afraid. 
What can mere mortals do to me? 
The Lord is with me; he is my helper. 
I look in triumph on my enemies.

It is better to take refuge in the Lord 
than to trust in humans.                             
Psalm 118: 5-8