I Samuel 18:1-5 and 23:15-18
1 Now when he had finished speaking to Saul, the soul of Jonathan was knit to the soul of David, and Jonathan loved him as his own soul.
2 Saul took him that day, and would not let him go home to his father’s house anymore.
3 Then Jonathan and David made a covenant, because he loved him as his own soul.
4 And Jonathan took off the robe that was on him and gave it to David, with his armor, even to his sword and his bow and his belt.
5 So David went out wherever Saul sent him, and behaved wisely. And Saul set him over the men of war, and he was accepted in the sight of all the people and also in the sight of Saul’s servants.
15 So David saw that Saul had come out to seek his life. And David was in the Wilderness of Ziph in a forest.
16 Then Jonathan, Saul’s son, arose and went to David in the woods and strengthened his hand in God.
17 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.”
18 So the two of them made a covenant before the LORD. And David stayed in the woods, and Jonathan went to his own house.