1 Samuel 20:41-42

As soon as the boy was gone, David got up from the south side [beside the mound of stones] and fell on his face to the ground [in submission and respect], and bowed three times. Then they kissed one another and wept together, but David wept more. Jonathan told David, “Go in safety, inasmuch as we have sworn to each other in the name of the LORD, saying, ‘The LORD shall be between me and you, and between my descendants and yours forever.’ ” Then he stood and left, while Jonathan went into the city.