1 Samuel 20:41-42

When the boy left, David came out from the south side of the rock. He bowed facedown on the ground before Jonathan three times. Then David and Jonathan kissed each other and cried together, but David cried the most. Jonathan said to David, “Go in peace. We have promised by the LORD that we will be friends. We said, ‘The LORD will be a witness between you and me, and between our descendants always.’ ” Then David left, and Jonathan went back to town.