if I have done evil to him who is at peace with me or without cause have robbed my foe, sounds like David's tryst with the Hittite and Bathsheba, that is remorse. His lust drew him to the woman, but he had no quarrel with her husband. Psalm seven is early, but it sounds like it was written later on. David kept three hundred men around, as capable as him in battle. He killed Goliath; they could also have killed Goliath. Fighting them would have been stalemate. Thank God for verbs and verb tense!
If he does not relent, he will sharpen his sword; he will bend and string his bow. These sound like the Book of Eli, with Denzel Washington: a sword so sharp it kills on its own, whetted (cat) oiled for thirty years on his walk across America. A bow prepared to shoot down a crow, or buzzard by the tuned ear of a (half) blind man in a cloudless sky.
Number three: He who digs a hole and scoops it out falls into the pit he has made. Reflection: You cannot kill a donkey, by burying it alive in a pit. It's too stubborn not to use its feet, to shift the dirt making a mound on which it walks up out of the hole alive.