By night — When evil accidents are most terrible and least avoidable. Arrow — The pestilence, or any such destructive calamity; such are frequently called God's arrows. By day — Thou shalt be kept from secret and open mischiefs.
Related Commentaries of Psalms 91:5
Psalms 91:5
5 Thou shalt not be afraid for the terror by night; nor for the arrow that flieth by day;