I Samuel 20:1-4

Then David fled from Naioth in Ramah, and went and said to Jonathan, “What have I done? What is my iniquity, and what is my sin before your father, that he seeks my life?” So Jonathan said to him, “By no means! You shall not die! Indeed, my father will do nothing either great or small without first telling me. And why should my father hide this thing from me? It is not so!” Then David took an oath again, and said, “Your father certainly knows that I have found favor in your eyes, and he has said, ‘Do not let Jonathan know this, lest he be grieved.’ But truly, as the LORD lives and as your soul lives, there is but a step between me and death.” So Jonathan said to David, “Whatever you yourself desire, I will do it for you.”