1 Samuel 20:4-14

4 Then said Jonathan to David, "Whatever you say, I will do for you."
5 David said to Jonathan, "Behold, tomorrow is the new moon, and I should not fail to sit at table with the king; but let me go, that I may hide myself in the field till the third day at evening.
6 If your father misses me at all, then say, 'David earnestly asked leave of me to run to Bethlehem his city; for there is a yearly sacrifice there for all the family.'
7 If he says, 'Good!' it will be well with your servant; but if he is angry, then know that evil is determined by him.
8 Therefore deal kindly with your servant, for you have brought your servant into a sacred covenant with you. But if there is guilt in me, slay me yourself; for why should you bring me to your father?"
9 And Jonathan said, "Far be it from you! If I knew that it was determined by my father that evil should come upon you, would I not tell you?"
10 Then said David to Jonathan, "Who will tell me if your father answers you roughly?"
11 And Jonathan said to David, "Come, let us go out into the field." So they both went out into the field.
12 And Jonathan said to David, "The LORD, the God of Israel, be witness! When I have sounded my father, about this time tomorrow, or the third day, behold, if he is well disposed toward David, shall I not then send and disclose it to you?
13 But should it please my father to do you harm, the LORD do so to Jonathan, and more also, if I do not disclose it to you, and send you away, that you may go in safety. May the LORD be with you, as he has been with my father.
14 If I am still alive, show me the loyal love of the LORD, that I may not die;