1 Samuel 23:13-18

Then David and his men, which were about six hundred, arose and departed out of Keilah, and went whithersoever they could go. And it was told Saul that David was escaped from Keilah; and he forbare to go forth. And David abode in the wilderness in strong holds, and remained in a mountain in the wilderness of Ziph. And Saul sought him every day, but God delivered him not into his hand. 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.