1 Samuel 19:4-5

Leeser(i) 4 And Jonathan spoke favorably of David unto Saul his father, and said unto him, Let not the king sin against his servant, against David; since he hath not sinned against thee, and because his deeds are very good for thee; 5 And he did put his life in his hand, and he slew the Philistine, and the Lord wrought a great salvation for all Israel; thou sawest it, and wast rejoiced: wherefore then wilt thou commit sin on innocent blood, by slaying David without a cause?