Psalms 91:5

The terror by night - Night is a time of terrors, because it is a time of treasons, plunder, robbery, and murder. The godly man lies down in peace, and sleeps quietly, for he trusts his body, soul, and substance, in the hand of God; and he knows that he who keepeth Israel neither slumbers nor sleeps. It may also mean all spiritual foes, - the rulers of the darkness of this world. I have heard the following petition in an evening family prayer: "Blessed Lord, take us into thy protection this night; and preserve us from disease, from sudden death, from the violence of fire, from the edge of the sword, from the designs of wicked men, and from the influence of malicious spirits!"

Nor for the arrow - The Chaldee translates this verse, "Thou shalt not fear the demons that walk by night; nor the arrow of the angel of death which is shot in the day time." Thou needest not to fear a sudden and unprovided-for death.

Thou shalt not be afraid for the terror by night - That which usually causes alarm at night - a sudden attack; an unexpected incursion of enemies; sudden disease coming on by night; or the pestilence which seems to love night, and to "walk in darkness." Any one of these things seems to be aggravated by night and darkness; and hence, we most dread them then. We cannot see their approach; we cannot measure their outlines; we know not the extent of the danger, or what may be the calamity.

Nor for the arrow that flieth by day - Whether shot from the bow of God - as pestilence and disease; or from the hand of man in battle. The idea is, that he that trusts in God will be calm. Compare the notes at Psalm 56:3.

91:5 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.