C. F. Keil and Franz Delitzsch on 1 Kings 17:17

1Ki 17:17 The widow’s deceased son raised to life again. - 1Ki 17:17. After these events, when Elijah had taken up his abode in the upper room of her house, her son fell sick, so that he breathed out his life. וגו אשׁר עד, literally till no breath remained in him. That these words do not signify merely a death-like torpor, but an actual decease, is evident from what follows, where Elijah himself treats the boy as dead, and the Lord, in answer to his prayer, restores him to life again.