1 Samuel 19:1-6

And Saul spake to Jonathan his son, and to all his servants, that they should slay David. But Jonathan, Saul’s son, delighted much in David. And Jonathan told David, saying, Saul my father seeketh to slay thee: now therefore, I pray thee, take heed to thyself in the morning, and abide in a secret place, and hide thyself: and I will go out and stand beside my father in the field where thou art, and I will commune with my father of thee; and if I see aught, I will tell thee. And Jonathan spake good of David unto Saul his father, and said unto him, Let not the king sin against his servant, against David; because he hath not sinned against thee, and because his works have been to thee-ward very good: for he put his life in his hand, and smote the Philistine, and Jehovah wrought a great victory for all Israel: thou sawest it, and didst rejoice; wherefore then wilt thou sin against innocent blood, to slay David without a cause? And Saul hearkened unto the voice of Jonathan: and Saul sware, As Jehovah liveth, he shall not be put to death.