1 Samuel 20:2-3

2And he said to him, "Far from it! You shall not die. Behold, my father does nothing either great or small without disclosing it to me. And why should my father hide this from me? It is not so."

3But David vowed again, saying, "Your father knows well that I have found favor in your eyes, and he thinks, '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."