1 Samuel 20:10-14

Then David said to Jonathan, “Who will inform me if your father answers you harshly?”

Jonathan said to David, “Come, and let’s go out to the field.” So both of them went out to the field.

Then Jonathan said to David, “The Lord, the God of Israel, is my witness! When I have sounded out my father about this time tomorrow or the third day, behold, if he has a good feeling toward you, shall I not then send word to you and inform you?

If it pleases my father to do you harm, may the Lord do so to me and more so, if I fail to inform you and send you away, so that you may go in safety. And may the Lord be with you as He has been with my father.

And if I am still alive, will you not show me the faithfulness of the Lord, so that I do not die?