1st Samuel 20:10

7 If he say thus, It is well; thy servant shall have peace: but if he be wroth, then know that evil is determined by him.

8 Therefore deal kindly with thy servant; for thou hast brought thy servant into a covenant of Jehovah with thee: but if there be in me iniquity, slay me thyself; for why shouldest thou bring me to thy father?

9 And Jonathan said, Far be it from thee; for if I should at all know that evil were determined by my father to come upon thee, then would not I tell it thee?

10 Then said David to Jonathan, Who shall tell me if perchance thy father answer thee roughly?

11 And Jonathan said unto David, Come, and let us go out into the field. And they went out both of them into the field.

12 And Jonathan said unto David, Jehovah, the God of Israel, [be witness]: when I have sounded my father about this time to-morrow, [or] the third day, behold, if there be good toward David, shall I not then send unto thee, and disclose it unto thee?

13 Jehovah do so to Jonathan, and more also, should it please my father to do thee evil, if I disclose it not unto thee, and send thee away, that thou mayest go in peace: and Jehovah be with thee, as he hath been with my father.