1st Samuel 20:10

7 If he says, It is well, your servant will be at peace: but if he is angry, then it will be clear to you that he has an evil purpose in mind against me.

8 So, then, be kind to your servant; for you have been united with your servant in an agreement made before the Lord: but if there is any wrongdoing in me, put me to death yourself; why take me to your father?

9 And Jonathan said, Do not have such a thought: for if I saw that my father was designing evil against you, would I not give you word of it?

10 Then David said to Jonathan, Who will give me word if your father gives you a rough answer?

11 And Jonathan said to David, Come, let us go out into the country. And the two of them went out together into the open country.

12 And Jonathan said to David, May the Lord, the God of Israel, be witness; when I have had a chance of talking to my father, about this time tomorrow, if his feelings to David are good, will I not send and give you the news?

13 May the Lord's punishment be on Jonathan, if it is my father's pleasure to do you evil and I do not give you word of it and send you away so that you may go in peace: and may the Lord be with you, as he has been with my father.