أَخْبَرَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، عَنْ سُفْيَانَ، عَنْ أَبِيهِ، عَنْ خَيْثَمَةَ، عَنِ الْبَرَاءِ، قَالَ ‏{‏ يُثَبِّتُ اللَّهُ الَّذِينَ آمَنُوا بِالْقَوْلِ الثَّابِتِ فِي الْحَيَاةِ الدُّنْيَا وَفِي الآخِرَةِ ‏}‏ قَالَ نَزَلَتْ فِي عَذَابِ الْقَبْرِ ‏.‏

It was narrated that: Al-Bara said about Allah will keep firm those who believe, with the word that stands firm in this world and in the Hereafter "It was revealed concerning the torment of the grave. Translation Not Available

Book Ref: Sunan An Nisai Book 21 Hadith 2056
Web Ref:  Sunan An Nisai Vol 3 Book 21 Hadith 2058