Thou shalt not be afraid for the terror by night When evil accidents are most terrible and least avoidable; nor for the arrow Any common and destructive calamity; (for such are commonly called God's arrows;) that flieth by day Which is the time for shooting arrows. The sense of the verse is, Thou shalt be kept from secret and open mischiefs at all times. Nor for the pestilence, &c. This verse explains the former, and shows what that terror and arrow signify; that walketh in darkness That makes progress and spreads death and desolation in an invisible manner, such as can neither be foreseen nor prevented; nor for the destruction at noon-day That, like a bold enemy, assaults us openly, and though discovered cannot be resisted.
Related Commentaries of Psalms 91:5
Psalms 91:5-6
5 Thou shalt not be afraid for the terror by night; nor for the arrow that flieth by day;
6 Nor for the pestilence that walketh in darkness; nor for the destruction that wasteth at noonday.