Because David was righteous. David did the right thing. So for this Benjaminite to accuse David of wronging Saul, for him to say that David was unethical, or that David had sinned against Saul — it’s just not true. David has walked with integrity.
Which is not the same as self-righteousness. Only the righteousness of Jesus makes us acceptable to God; it’s our integrity that makes us usable for God; and every bit of it is grace. Grace is the rock bottom, which means there’s never any room for pride.
David is not being prideful in Psalm 7, he’s just saying: God, you know! You hear the words of Cush the Benjaminite, and you know I have walked in the integrity of my heart. So, God, you have to judge this thing.
That’s David’s appeal. And it’s all focusing in on verse 9. This is David’s hope.
