1 Samuel 20:17

And Jonathan caused David to swear again, because he loved him: for he loved him as he loved his own soul.
— 1 Samuel 20:17, King James Version

In other translations

World English Bible (WEB)

Jonathan caused David to swear again, for the love that he had to him; for he loved him as he loved his own soul.

American Standard Version (ASV)

And Jonathan caused David to swear again, for the love that he had to him; for he loved him as he loved his own soul.

Young's Literal Translation (YLT)

and Jonathan addeth to cause David to swear, because he loveth him, for with the love of his own soul he hath loved him.