Behold the king's spear, &c. He did not think it proper to put himself in Saul's power by going and presenting it himself to him. The Lord render to every man his righteousness In these words David shows the assurance he had that, however Saul dealt by him, the Lord would vindicate his cause on account of his integrity and righteous dealing. So let my life be much set by, &c. He prays that God would spare his life as he had spared Saul's, and show him similar mercy, and then he trusted that he should be delivered out of all his troubles.
Related Commentaries of 1 Samuel 26:22
1 Samuel 26:22-24
22 And David answered and said, Behold the king's spear! and let one of the young men come over and fetch it.
23 The LORD render to every man his righteousness and his faithfulness: for the LORD delivered thee into my hand to day, but I would not stretch forth mine hand against the LORD'S anointed.
24 And, behold, as thy life was much set by this day in mine eyes, so let my life be much set by in the eyes of the LORD, and let him deliver me out of all tribulation.