1 Samuel 19:4 - Ellicott's Commentary On The Whole Bible

Jonathan spake good of David. — The heir to the throne — the one above all men likely to be injured by the growing popularity of David — with great power and intense earnestness, represented to his father the king the great virtues, the unrivalled gifts, and, above all, the splendid services of the young soldier whose life Saul was so anxious to cut short. “See,’ urged the eloquent pleader for his friend’s life, “on that ever memorable occasion when he fought the giant, when he aimed the pebble of the brook from his shepherd’s sling, he put his life in his hand. Had he missed a hair’s-breadth, the giant would have slain him, and the deliverance then wrought for Israel would never have been accomplished.”