1 Samuel 23:15-18

And David saw that Saul was come out to seek his life: and David was in the wilderness of Ziph in a wood. And Jonathan Saul's son arose, and went to David into the wood, and strengthened his hand in God. And he said unto him, Fear not: for the hand of Saul my father shall not find thee; and thou shalt be king over Israel, and I shall be next unto thee; and that also Saul my father knoweth. And they two made a covenant before the LORD: and David abode in the wood, and Jonathan went to his house.