1 Samuel 20:17 in the World English Bible
Jonathan caused David to swear again, for the love that he had for him; for he loved him as he loved his own soul.
Context
16 So Jonathan made a covenant with the house of David, saying, Let the LORD even require it at the hand of David’s enemies.
17 And Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul.
18 Then Jonathan said to David, To morrow is the new moon: and thou shalt be missed, because thy seat will be empty.