1 Samuel 19:4-5

4Jonathan spoke well of David to his father, Saul. He said to him, “The king should not sin against his servant David. He hasn’t sinned against you; in fact, his actions have been a great advantage to you.

5He took his life in his hands when he struck down the Philistine, and the Lord brought about a great victory for all Israel. You saw it and rejoiced, so why would you sin against innocent blood by killing David for no reason?”