New Defender's Study Bible Notes
7:1 put my trust. Compare Psalm 2:8. David had been grievously slandered by Cush to Saul, it would seem, and this was contributing to Saul’s persecution of David. As with many psalms of this nature, it can also be understood as prophetic of the unjust sufferings of Christ. Nevertheless David maintained his trust in God, as did Christ in His Father. This is often considered one of the imprecatory psalms.
7:2 like a lion. Satan is like a roaring lion, seeking to destroy David, and especially the Messiah (I Peter 5:8).
7:4 delivered him. This protest against slandered innocence is apparently in reference to David sparing Saul’s life on the two occasions when he could easily have slain him (I Samuel 24:3-10; 26:5-9).
7:9 reins. The older term for the “kidneys,” symbolic of inner emotions.