Shemu’ĕl Aleph (1 Samuel) 20:16-17

And Yehonathan made a covenant with the house of Dawiḏ, saying, “יהוה shall require it at the hand of the enemies of Dawiḏ.” And Yehonathan again made Dawiḏ swear, because he loved him, for he loved him as he loved his own being.