I Samuel 24:8

But when Saul had gone out of the cave, David went out, and called, "My lord king," that when the king looked round he might expostulate with him, with the deepest reverence, but yet with earnest words, that should sharpen his conscience as to the unfounded nature of his suspicion and the injustice of his persecution. "Why dost thou hearken to words of men, who say, Behold, David seeketh thy hurt? Behold, this day thine eyes have been that Jehovah hath given thee to-day into my hand in the cave, and they said (אמר, thought) to kill thee, and I spared thee:" lit. it (mine eye) spared thee (cf. Gen 45:20; Deu 7:16, etc., which show that עיני is to be supplied).

We have hitherto had Saul seeking an opportunity to destroy David, and, to his shame, he could never find it. In this chapter David had a fair opportunity to destroy Saul, and, to his honour, he did not make use of it; and his sparing Saul's life was as great an instance of God's grace in him as the preserving of his own life was of God's providence over him. Observe, I. How maliciously Saul sought David's life (Sa1 24:1, Sa1 24:2). II. How generously David saved Saul's life (when he had him at an advantage) and only cut off the skirt of his robe (Sa1 24:3-8). III. How pathetically he reasoned with Saul, upon this to bring him to a better temper towards him (Sa1 24:9-15). IV. The good impression this made upon Saul for the present (Sa1 24:16-22).