1 Samuel 18:1-4

Now it came about when he had finished speaking to Saul, that the soul of Jonathan was knit to the soul of David, and Jonathan loved him as himself. Saul took him that day and did not let him return to his father’s house. Then Jonathan made a covenant with David because he loved him as himself. Jonathan stripped himself of the robe that was on him and gave it to David, with his armor, including his sword and his bow and his belt.