7. Because of the Lord’s oath. See 1 Sam. 18:3; 20:12-17. The solemn oath that David had sworn to Jonathan required that he exempt the son of Jonathan from the proposed vengeance of Gibeon. The fact that the violation of the solemn oath of the leaders of Israel to the men of Gibeon (Joshua 9:15, 19-21), had brought this great calamity upon Israel, would cause David to be particularly careful that there would be no violation of the oath he had made to Jonathan.