Evidence that the islam of one who becomes muslim on his deathbed is valid, so long as the death thoes have not begun; Abrogation of permission to supplicate for forgiveness for the idolaters; Evidence that one who dies an idolater is one of the people of hell and no intervention can save him from that
The Messenger of Allah (ﷺ) lagged behind us on a journey. We travelled (back) and be took him; and then came the time of the afternoon prayer, and as we were going to wipe our feet he (the Holy Prophet) called out: Woe to the heels because of Hell-fire.
Reference: Sahih Muslim 241c In-book : Book 2, Hadith 39 USC-MSA web (English) : Book 2, Hadith 470 (deprecated)
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