Adam Clarke's Bible Commentary Verse 3. Thou, O Lord art a shield ] As a shield covers and defends the body from the strokes of an adversary, so wilt thou cover and defend me from them that rise up against me.
The lifter up of mine head. ] Thou wilt restore me to the state from which my enemies have cast me down. This is the meaning of the phrase; and this he speaks prophetically. He was satisfied that the deliverance would take place, hence his confidence in prayer; so that we find him, with comparative unconcern, laying himself down in his bed, expecting the sure protection of the Almighty.
Matthew Henry Commentary
Verses 1-3 - An active believer, the more he is beaten off from God, either by the rebukes of providence, or the reproaches of enemies, the faster hold he will take, and the closer will he cleave to him. A child of God startles at the very thought of despairing of help in God. See what God is to his people, what he will be, what they have found him, what Davi found in him. 1. Safety; a shield for me; which denotes the advantag of that protection. 2. Honour; those whom God owns for his, have tru honour put upon them. 3. Joy and deliverance. If, in the worst of times, God's people can lift up their heads with joy, knowing that all shall work for good to them, they will own God as giving them bot cause and hearts to rejoice.
Original Hebrew ואתה859 יהוה3068 מגן4043 בעדי1157 כבודי3519 ומרים7311 ראשׁי׃7218