It was narrated that 'Aishah said:
"I asked the Messenger of Allah ﷺ about the torment of the grave, and he siad: 'Yes, the torment of the grave is real.'" 'Aishah said: "After that I never saw the Messenger of Allah ﷺ offer any prayer but he would seek refuge with Allah (Subhanahu-wa-Taala) from the torment of the grave."
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، عَنْ مُحَمَّدٍ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ أَشْعَثَ، عَنْ أَبِيهِ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ عَذَابِ الْقَبْرِ فَقَالَ " نَعَمْ عَذَابُ الْقَبْرِ حَقٌّ " . قَالَتْ عَائِشَةُ فَمَا رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُصَلِّي صَلاَةً بَعْدُ إِلاَّ تَعَوَّذَ مِنْ عَذَابِ الْقَبْرِ .
• Sunan an-Nasa'i, 1308
• Sunan an-Nasa'i, Vol. 2, Book of Forgetfulness (In Prayer), Hadith 1309
• Sunan an-Nasa'i, Book of Forgetfulness (In Prayer), Hadith 1309