1 Samuel 20:11-17

“Let's go out to the fields,” Jonathan answered. So they went, and Jonathan said to David, “May the LORD God of Israel be our witness! At this time tomorrow and on the following day I will question my father. If his attitude toward you is good, I will send you word. If he intends to harm you, may the LORD strike me dead if I don't let you know about it and get you safely away. May the LORD be with you as he was with my father! And if I remain alive, please keep your sacred promise and be loyal to me; but if I die, show the same kind of loyalty to my family forever. And when the LORD has completely destroyed all your enemies, may our promise to each other still be unbroken. If it is broken, the LORD will punish you.” Once again Jonathan made David promise to love him, for Jonathan loved David as much as he loved himself.