Psalm 121:4
"Behold, he that keepeth Israel shall neither slumber nor sleep."
Cross References (ranked by relevance)
Except the LORD build the house, they labour in vain that build it: except the LORD keep the city, the watchman waketh but in vain.
I the LORD do keep it; I will water it every moment: lest any hurt it, I will keep it night and day.
When I applied mine heart to know wisdom, and to see the business that is done upon the earth: (for also there is that neither day nor night seeth sleep with his eyes:)
And it came to pass at noon, that Elijah mocked them, and said, Cry aloud: for he is a god; either he is talking, or he is pursuing, or he is in a journey, or peradventure he sleepeth, and must be awaked.
Therefore are they before the throne of God, and serve him day and night in his temple: and he that sitteth on the throne shall dwell among them.
The LORD is my light and my salvation; whom shall I fear? the LORD is the strength of my life; of whom shall I be afraid?