Psalm 91:4

He shall cover thee with his feathers, and under his wings shalt thou trust: his truth shall be thy shield and buckler.

He shall cover thee with his feathers,.... As birds do their young, who cannot cover themselves: this they do from a tender regard to them, whereby they both keep them warm, and protect them from those that would hurt them: this represents the helpless state of the children of God, who are, like to young birds, weak and unable to defend themselves: the tender regard of God unto them, as the eagle and other birds have to their young; see Deuteronomy 32:11 and the warmth and comforts souls have, as well as protection, under his powerful and gracious presence; he comforts them under their tribulations, as well as defends them from their enemies:

and under his wings shalt thou trust; See Gill on "Psalms 91:1" and the passages there referred to; the same metaphor is continued:

his truth shall be thy shield and buckler; his faithfulness, which is engaged to keep and preserve his saints safe to his kingdom and glory, 1 Corinthians 1:8, his Son, who is "truth" itself, John 14:6, and whose person, blood, righteousness, and salvation, are as a shield and buckler all around the saints, to secure them from ruin and destruction; and are the shield which faith lays hold on, and makes use of, against the temptation, of Satan; see Psalms 84:11, the word of God also, which is truth, John 17:19, every promise in it, and doctrine of it, is as a shield and buckler to strengthen, support, and secure the faith of his people, Proverbs 30:5.