Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet.
The first verse states two distinct truths, not one repeated twice as some wrongly suppose. He who dwells in God's secret place and abides under His shadow, these are two separate ideas working together, each adding weight to the promise of safety.
AI summary
Commenting on Psalm 91:1-16
Thou shalt tread upon the lion and adder. Over force and fraud shalt thou march victoriously; bold opponents and treacherous adversaries shall alike be trodden down. When our shoes are iron and brass lions and adders are easily enough crushed beneath our heel. The young lion and the dragon shalt thou trample under feet.
Here are more promises to the same purport with those in the foregoing verses, and they are exceedingly great and precious, and sure to all the seed. I. The psalmist assures believers of divine protection, from his own experience; and that which he says is the word of God, and what we may rely upon. Observe, 1.
Commenting on Psalm 91:9-16