Passage
The sun will not strike you by day, Nor the moon by night.
Psalms 121:6 (LSB)
Nearby Context
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.
Psalms 121:7 Yahweh will keep you from all evil; He will keep your soul.
Psalms 121:8 Yahweh will keep your going out and your coming in From now until forever.
Study Lenses
The verse centers on "strike", "moon", and "night". It is saying that the verse draws attention to "strike" and "moon", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 5's "Yahweh is your keeper Yahweh is your..." into verse 7's "Yahweh will keep you from all evil...", so "strike" and "moon" 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 "strike" and "moon" with trust shaped by these words, not by a vague optimism outside the passage.