1 Samuel 23:16-18

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.