Psalms 3:7

The teeth of sinners are thoughts foreign to reason coming to us on account of our nature by which our enemies approach us, just like using their teeth time after time again to devour our flesh. That is, those [are] things that spring forth from …

And whence he has this confidence he shows when he says, "arise," that is, manifest your power by making me rise from death. And this means, "save me," etc. "Because you have struck," etc. Above he had said two things: that they trouble him -- …

Saul and the Philistines, who were sometimes ready to swallow him up, could not effect what they designed. The teeth that are gnashed or sharpened against God's people shall be broken. When, at any time, the power of the church's enemies seems threatening, it is good to remember how often God has broken it; and we are sure that his arm is not shortened.

Arise, O Lord; save me, O my God,....

Gives God the glory and takes to himself the comfort of the divine blessing and salvation which are sure to all the people of God,

Arise, O Lord - This is a common mode of calling upon God in the Scriptures, as if he had been sitting still, or had been inactive. It is, of course, language taken from human conceptions, for in the intervals of active effort, in labor or in battle, we sit or lie down, and when we engage in toil we arise from our sitting or recumbent posture. So the mind accustoms itself to think of God. The idea is simply that David now calls upon God to interpose in his behalf and to deliver him.

Arise, O Lord--God is figuratively represented as asleep to denote His apparent indifference (Ps 7:6). The use of "cheekbone" and "teeth" represents his enemies as fierce, like wild beasts ready to devour (Ps 27:2), and smiting their cheekbone (1Ki 22:24) denotes violence and insult. thou hast broken--God took his part, utterly depriving the enemy of power to injure.

His only hope is in his God, but that is so strong a confidence, that he feels the Lord hath but to arise and he is saved. It is enough for the Lord to stand up, and all is well. He compares his enemies to wild beasts, and he declares that God hath broken their jaws, so that they could not injure him; "Thou hast broken the teeth of the ungodly." Or else he alludes to the peculiar temptations to which he was then exposed. They had spoken against him; God, therefore, has smitten them upon the cheek bone.

His only hope is in his God, but that is so strong a confidence, that he feels the Lord hath but to arise and he is saved. It is enough for the Lord to stand up, and all is well. He compares his enemies to wild beasts, and he declares that God hath broken their jaws, so that they could not injure him; "Thou hast broken the teeth of the ungodly." Or else he alludes to the peculiar temptations to which he was then exposed. They had spoken against him; God, therefore, has smitten them upon the cheek bone. They seemed as if they would devour him with their mouths; God hath broken their teeth, and let them say what they will, their toothless jaws shall not be able to devour him. Rejoice, O believer, thou hast to do with a dragon whose head is broken, and with enemies whose teeth are dashed from their jaws!

Arise, O Lord - Though he knew that God had undertaken his defense, yet he knew that his continued protection depended on his continual prayer and faith. God never ceases to help as long as we pray. When our hands hang down, and we restrain prayer before him, we may then justly fear that our enemies will prevail. Those blast smitten - That is, Thou wilt smite. He speaks in full confidence of God’s interference; and knows as surely that he shall have the victory, as if he had it already. Breaking the jaws and the teeth are expressions which imply, confounding and destroying an adversary; treating him with extreme contempt; using him like a dog, etc.