Commentaries:
Jamieson, Fausset, and Brown
Arise, O Lord—God is figuratively represented as asleep to denote His apparent indifference (Psalms 7:6). The use of "cheekbone" and "teeth" represents his enemies as fierce, like wild beasts ready to devour (Psalms 27:2), and smiting their cheekbone (I Kings 22:24) denotes violence and insult.
thou hast broken—God took his part, utterly depriving the enemy of power to injure.
Other Jamieson, Fausset, and Brown entries containing Psalms 3:7:
Job 29:17
Psalms 3:1
Psalms 7:6
Psalms 10:12
Psalms 44:23-26
Psalms 58:6
Psalms 59:4-5
Psalms 69:16-18
Psalms 74:11
Psalms 74:22-23
Psalms 94:2
Psalms 124:6-7
Song of Solomon 4:2
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