Charles H. Spurgeon on Psalms 91:5

The arrow. The arrow in this passage probably means the pestilence. The Arabs denote the pestilence by an allusion to this flying weapon. "I desired to remove to a less contagious air. I received from Solyman, the emperor, this message; that the emperor wondered what I meant, in desiring to remove my habitation; is not the pestilence God's arrow, which will always hit his mark? If God would visit me here with, how could I avoid it? is not the plague, said he, in my own palace, and yet I do not think of removing." Busbequiu's Travels. "What, say they, is not the plague the dart of Almighty God, and can we escape the blow that he levels at us? is not his hand steady to hit the persons he aims at? can we run out of his sight, and beyond his power?" Smith's Remarks on the Turks, 1673. Herbert also, speaking of Curroon, says, "That year his empire was so wounded with God's arrows of plague, pestilence, and famine, as this thousand years before was never so terrible." See Eze 5:16. S. Burder's Scripture Expositor.

Verses 5-6. Joseph Scaliger explains, in Epis. 9, these two verses thus, thou shalt not fear, dxkm, from consternation by night, Uxm, from the arrow flying by day, rgdm, from pestilence walking at evening, kymqm, from devastation at noon. Under these four he comprehends all the evils and dangers to which man is liable. And as the Hebrews divide the twenty-four hours of day and night into four parts, namely, evening, midnight, morning, and midday, so he understands the hours of danger to be divided accordingly: in a word, "that the man who has made God his refuge, "is always safe, day and night, at every hour, from every danger. Bythner.