1 Samuel 20 17
Jonathan made David swear this once more by making an oath based on David's love for him, for Jonathan already loved David as he loved himself.
Compare with other 3 random translations
NIV 1 Samuel 20:17And Jonathan had David reaffirm his oath out of love for him, because he loved him as he loved himself.
KJV 1 Samuel 20:17And Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul.
CSB 1 Samuel 20:17Jonathan once again swore to David in his love for him, because he loved him as he loved himself.