1 Samuel 19:4-5

4So Jonathan spoke well of David to his father Saul and said to him, “May the king not sin against his servant David, since he has not sinned against you, and since his deeds have been very beneficial for you;

5For he put his life in his hand and killed the Philistine, and Adonai won a great victory for all Israel—you saw it and rejoiced. So why would you sin against innocent blood by killing David without a cause?”