1 Samuel 24:16

Is this thy voice, my son David? He knew his voice, though, being at a great distance from him, he could not discern his face. Saul lifted up his voice and wept Being overcome with David's kindness, in sparing his life when he could have taken it away, and conscious of his base carriage toward him. He speaks as one that relented at the sight of his own folly and ingratitude. “David's kindness,” says Samuel Clark, “drew tears from hard-hearted Saul, as Moses fetched water out of the flinty rock,” Deuteronomy 8:15. Perhaps, however, he was also affected with a sense of his sins against God. But it does not appear from his future conduct that he was a true penitent, for he did not bring forth fruits meet for repentance.