Passage
Behold, He who keeps Israel Will not slumber and will not sleep.
Behold, He who keeps Israel Will not slumber and will not sleep.
Psalms 121:2 My help comes from Yahweh, Who made heaven and earth.
Psalms 121:3 He will not allow your foot to stumble; He who keeps you will not slumber.
Psalms 121:4 Behold, He who keeps Israel Will not slumber and will not sleep.
Psalms 121:5 Yahweh is your keeper; Yahweh is your shade on your right hand.
Psalms 121:6 The sun will not strike you by day, Nor the moon by night.
The verse centers on "behold", "keeps", "israel", "slumber", and "sleep". It is saying that the verse draws attention to "behold" and "keeps", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 3's "He will not allow your foot to..." into verse 5's "Yahweh is your keeper Yahweh is your...", so "behold" and "keeps" belong inside that flow. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "behold" and "keeps" with trust shaped by these words, not by a vague optimism outside the passage.