1 Samuel 18:1-5

After David had finished talking with Saul, he met Jonathan, the king’s son. There was an immediate bond between them, for Jonathan loved David. From that day on Saul kept David with him and wouldn’t let him return home. And Jonathan made a solemn pact with David, because he loved him as he loved himself. Jonathan sealed the pact by taking off his robe and giving it to David, together with his tunic, sword, bow, and belt. Whatever Saul asked David to do, David did it successfully. So Saul made him a commander over the men of war, an appointment that was welcomed by the people and Saul’s officers alike.