I Samuel 19:2-5

So Jonathan told David, saying, “My father Saul seeks to kill you. Therefore please be on your guard until morning, and stay in a secret place and hide. And I will go out and stand beside my father in the field where you are, and I will speak with my father about you. Then what I observe, I will tell you.” Thus Jonathan spoke well of David to Saul his father, and said to him, “Let not 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. For he took his life in his hands and killed the Philistine, and the LORD brought about a great deliverance for all Israel. You saw it and rejoiced. Why then will you sin against innocent blood, to kill David without a cause?”