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1 Samuel 20:17BSB·author unknown

And Jonathan had David reaffirm his vow out of love for him, for Jonathan loved David as he loved himself.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. Jonathan protests his fidelity to David in his distress. Notwithstanding the strong confidence David had in Jonathan, yet, because he might have some reason to fear that his father's influence, and his own interest, should make him warp, or grow cool towards him, Jonathan thought it requisite solemnly to renew the professions of his friendship to him (Sa1 20:9): "Far be it from...

Commenting on 1 Samuel 20:9-23

John Gill Reformed Baptist @doctorgill

And Jonathan caused David to swear again,.... Or Jonathan added to make David swears (u); having sworn himself to make a covenant of friendship with David and his family, he moved and insisted on it, that David should swear to keep covenant with him, and his family: because he loved him; it was not so much for the good and safety of his offspring that...

Keil & Delitzsch Lutheran @keilanddelitzsch

1Sa 20:17 “And Jonathan adjured David again by his love to him, because he loved him as his own soul” (cf. 1Sa 18:1, 1Sa 18:3); i.e., he once more implored David most earnestly with an oath to show favour to him and his house.