Sunan an-Nasa'i, Hadith 5504 ⓘ
It was narrated from 'Aishah that: The Prophet [SAW] used to seek refuge with Allah from the torment of the grave and the tribulation of the Dajjal, and he said: "You will be tried in your graves."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ يَحْيَى، عَنْ عَمْرَةَ، عَنْ عَائِشَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يَسْتَعِيذُ بِاللَّهِ مِنْ عَذَابِ الْقَبْرِ وَمِنْ فِتْنَةِ الدَّجَّالِ قَالَ وَقَالَ " إِنَّكُمْ تُفْتَنُونَ فِي قُبُورِكُمْ " .
also referenced under: Book 50, Hadith 77 (In-Book) & Volume 6, Book 50, Hadith 5506 (DarusSalam)