A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown [1882] at sacred-texts.com
Psalms Chapter 91
David is the most probable author; and the pestilence, mentioned in Sa2 24:13-15, the most probable of any special occasion to which the Psalm may refer. The changes of person allowable in poetry are here frequently made. (Psa. 91:1-16)
dwelleth in the secret place-- (Psa 27:5; Psa 31:20) denotes nearness to God. Such as do so abide or lodge secure from assaults, and can well use the terms of trust in Psa 91:2.
snares . . . [and] . . . noisome pestilence--literally, "plagues of mischiefs" (Psa 5:9; Psa 52:7), are expressive figures for various evils.
For the first figure compare Deu 32:11; Mat 23:37.
buckler--literally, "surrounding"--that is, a kind of shield covering all over.
terror--or, what causes it (Pro 20:2).
by night--then aggravated.
arrow--that is, of enemies.
The security is more valuable, as being special, and, therefore, evidently of God; and while ten thousands of the wicked fall, the righteous are in such safety that they only see the calamity.
This exemption from evil is the result of trust in God, who employs angels as ministering spirits (Heb 1:14).
Even the fiercest, strongest, and most insidious animals may be trampled on with impunity.
God Himself speaks (compare Psa 46:10; Psa 75:2-3). All the terms to express safety and peace indicate the most undoubting confidence (compare Psa 18:2; Psa 20:1; Psa 22:5).
set his love--that of the most ardent kind.
show him--literally, "make him see" (Psa 50:23; Luk 2:30).