Jonathan spoke good of David to Saul his father, and said to him, Don't let the king sin against his servant, against David; because he has not sinned against you, and because his works have been very good toward you:
Jonathan’s appeal was successful, at least temporarily, and resulted in Saul solemnly vowing not to kill David (1 Samuel 19:6), which vow he broke shortly (1 Samuel 19:10). Later Jonathan was not as successful (1 Samuel 20:28-29). Nevertheless this time his appeal resulted in David’s restoration to the court and his continuing ministry to the king (1 Samuel 19:7).