Psalms 91:13

13.Thou shalt walk over the lion and asp. The same truth is here expressed in different words. He had already spoken of the obstacles which Satan throws in our course under the figure of a stone. Now he speaks of the formidable troubles to which we are exposed in the world under the figures of the asp, lion, young lion, and dragon So long as we are here we may be truly said to walk amongst wild beasts, and such as threaten us with destruction. And in this case what would become of us did not God promise to make us victorious over the manifold evils which everywhere impend us? None who seriously considers the temptations to which he is liable will wonder that the Psalmist, with the view of removing apprehension from the minds of the Lord’s people, should have adopted the language of hyperbole; nor indeed will he say that it is the language of hyperbole, but a true and exact representation of their case. We boast much of our courage so long as we remain at a distance from the scene of danger; but no sooner are we brought into action, than in the smallest matters we conjure up to ourselves lions, and dragons, and a host of frightful dangers. The Psalmist accommodates his language to this infirmity of our carnal apprehension. The Hebrew word שחל, shachal, which in the Septuagint is rendered asp, (581) signifies a lion, and such repetition in the second member of the sentence is usual in the Hebrew. There is therefore no occasion for seeking any nice distinction which may have been intended in specifying these four different kinds of animals; only by the lion and young lion we are evidently to understand more open dangers, where we are assailed by force and violence, and by the serpent and dragon hidden mischiefs, where the enemy springs upon us insidiously and unexpectedly, as the serpent from its lurking place. (582)

Cresswell thinks it probable that the language of this verse is proverbial. “The course of human life,” he remarks, “is in Scripture compared to a journey; and the dangers described in this verse were common to the wayfaring man in the Psalmist’s time and country.”