The Book of Paradise, its Description, its Bounties and its Inhabitants
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَمُحَمَّدُ بْنُ الْمُثَنَّى، وَأَبُو بَكْرِ بْنُ نَافِعٍ قَالُوا حَدَّثَنَا عَبْدُ الرَّحْمَنِ، - يَعْنُونَ ابْنَ مَهْدِيٍّ - عَنْ سُفْيَانَ، عَنْ أَبِيهِ، عَنْ خَيْثَمَةَ، عَنِ الْبَرَاءِ بْنِ عَازِبٍ، { يُثَبِّتُ اللَّهُ الَّذِينَ آمَنُوا بِالْقَوْلِ الثَّابِتِ فِي الْحَيَاةِ الدُّنْيَا وَفِي الآخِرَةِ} قَالَ نَزَلَتْ فِي عَذَابِ الْقَبْرِ .Al-Bara' b. 'Azib reported that this verse:"Allah keeps those who believe steadfast with firm word in this world and the Hereafter" was revealed in connection with the torment of the grave
From Sahih Muslim, whose reports the scholars accept as authentic.