1 Samuel 19:5

For he did put his life in his hand, risking his most precious possession, and slew the Philistine, and the Lord wrought a great salvation for all Israel, in delivering the people from the danger threatened by the Philistines; thou sawest it and didst rejoice. Wherefore, then, wilt thou sin against innocent blood to slay David without a cause? It was an urgent, yet modest appeal to whatever nobility was still left in Saul's character; a fine example to all men of how to speak the best of their neighbors.