1 Samuel 20:2-3

2So 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!”

3Then 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.”