Sahih Muslim 2871
Sahih Muslim · Book 53: The Book of Paradise, its Description, its Bounties and its Inhabitants · The Deceased Is Shown His Place In Paradise Or The Fire; And Confirmation Of The Torment In The Grave - We Seek Refuge With Allah From That
Al-Bara' b. 'Azib reported that this verse:
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 .
"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.