1 Samuel 20:41-42

After the boy had left, David got up from behind the pile of stones, fell on his knees and bowed with his face to the ground three times. Both he and Jonathan were crying as they kissed each other; David's grief was even greater than Jonathan's. Then Jonathan said to David, “God be with you. The LORD will make sure that you and I, and your descendants and mine, will forever keep the sacred promise we have made to each other.” Then David left, and Jonathan went back to the town.