1 Samuel 20:17 in the King James Version
And Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul.
Context
16 So Jonathan made a covenant with David’s house, saying, “The LORD will require it at the hand of David’s enemies.”
17 Jonathan caused David to swear again, for the love that he had for him; for he loved him as he loved his own soul.
18 Then Jonathan said to him, “Tomorrow is the new moon, and you will be missed, because your seat will be empty.