1 Samuel 18:3-4
3-4Jonathan, out of his deep love for David, made a covenant with him. He formalized it with solemn gifts: his own royal robe and weapons—armor, sword, bow, and belt.
5Whatever Saul gave David to do, he did it—and did it well. So well that Saul put him in charge of his military operations. Everybody, both the people in general and Saul's servants, approved of and admired David's leadership.