1 Samuel 20:1-13 (NIV)
Then David fled from Naioth at Ramah and went to Jonathan and asked, “What have I done? What is my crime? How have I wronged your father, that he is trying to kill me?”
“Never!” Jonathan replied. “You are not going to die! Look, my father doesn’t do anything, great or small, without letting me know. Why would he hide this from me? It isn’t so!”
But David took an oath and said, “Your father knows very well that I have found favor in your eyes, and he has said to himself, ‘Jonathan must not know this or he will be grieved.’ Yet as surely as the Lord lives and as you live, there is only a step between me and death.”
Jonathan said to David, “Whatever you want me to do, I’ll do for you.”
So David said, “Look, tomorrow is the New Moon feast, and I am supposed to dine with the king; but let me go and hide in the field until the evening of the day after tomorrow. If your father misses me at all, tell him, ‘David earnestly asked my permission to hurry to Bethlehem, his hometown, because an annual sacrifice is being made there for his whole clan.’ If he says, ‘Very well,’ then your servant is safe. But if he loses his temper, you can be sure that he is determined to harm me. As for you, show kindness to your servant, for you have brought him into a covenant with you before the Lord. If I am guilty, then kill me yourself! Why hand me over to your father?”
“Never!” Jonathan said. “If I had the least inkling that my father was determined to harm you, wouldn’t I tell you?”
David asked, “Who will tell me if your father answers you harshly?”
“Come,” Jonathan said, “let’s go out into the field.” So they went there together.
Then Jonathan said to David, “I swear by the Lord, the God of Israel, that I will surely sound out my father by this time the day after tomorrow! If he is favorably disposed toward you, will I not send you word and let you know? But if my father intends to harm you, may the Lord deal with Jonathan, be it ever so severely, if I do not let you know and send you away in peace. May the Lord be with you as he has been with my father.