I Samuel 23:13-18

So David and his men, about six hundred, arose and departed from Keilah and went wherever they could go. Then it was told Saul that David had escaped from Keilah; so he halted the expedition. And David stayed in strongholds in the wilderness, and remained in the mountains in the Wilderness of Ziph. Saul sought him every day, but God did not deliver him into his hand. So David saw that Saul had come out to seek his life. And David was in the Wilderness of Ziph in a forest. Then Jonathan, Saul’s son, arose and went to David in the woods and strengthened his hand in God. And he said to him, “Do not fear, for the hand of Saul my father shall not find you. You shall be king over Israel, and I shall be next to you. Even my father Saul knows that.” So the two of them made a covenant before the LORD. And David stayed in the woods, and Jonathan went to his own house.