TSK
Treasury of Scripture Knowledge references in WEB.
If your brother, the son of your mother, or your son, or your daughter, or the wife of your bosom, or your friend, who is as your own soul, entice you secretly, saying, "Let us go and serve other gods," which you have not known, you, nor your fathers;
Now it fell on a day, that Jonathan the son of Saul said to the young man who bore his armor, "Come, and let us go over to the Philistines' garrison, that is on the other side." But he didn't tell his father.
Then Jonathan and David made a covenant, because he loved him as his own soul.
Jonathan told David, saying, "Saul my father seeks to kill you. Now therefore, please take care of yourself in the morning, and live in a secret place, and hide yourself.
Jonathan caused David to swear again, for the love that he had to him; for he loved him as he loved his own soul.
They both made a covenant before Yahweh: and David stayed in the woods, and Jonathan went to his house.
David went out to meet them, and answered them, "If you have come peaceably to me to help me, my heart shall be knit to you; but if you have come to betray me to my adversaries, since there is no wrong in my hands, may the God of our fathers look thereon, and rebuke it."
A man of many companions may be ruined, but there is a friend who sticks closer than a brother.