I heard the Prophet ﷺ seeking refuge with Allah from the punishment of the grave.  

سَمِعَ مِنَ النَّبِيِّ ﷺ غَيْرَهَا قَالَتْ سَمِعْتُ النَّبِيَّ ﷺ يَتَعَوَّذُ مِنْ عَذَابِ الْقَبْرِ  

Saʿd used to recommend five (statements) and mentioned that the Prophet ﷺ I used to recommend it. (It was) "O Allah! I seek refuge with You from miserliness; and seek refuge with You from cowardice; and seek refuge with You from being sent back to geriatric old age; and I seek refuge with You from the affliction of this world (i.e., the affliction of Ad-Dajjal etc.); and seek refuge with You from the punishment of the grave."  

عَنْ مُصْعَبٍ كَانَ سَعْدٌ يَأْمُرُ بِخَمْسٍ وَيَذْكُرُهُنَّ عَنِ النَّبِيِّ ﷺ أَنَّهُ كَانَ يَأْمُرُ بِهِنَّ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْبُخْلِ وَأَعُوذُ بِكَ مِنَ الْجُبْنِ وَأَعُوذُ بِكَ أَنْ أُرَدَّ إِلَى أَرْذَلِ الْعُمُرِ وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الدُّنْيَا يَعْنِي فِتْنَةَ الدَّجَّالِ وَأَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ  

Two old ladies from among the Jewish ladies entered upon me and said' "The dead are punished in their graves," but I thought they were telling a lie and did not believe them in the beginning. When they went away and the Prophet ﷺ entered upon me, I said, "O Messenger of Allah ﷺ! Two old ladies.." and told him the whole story. He said, "They told the truth; the dead are really punished, to the extent that all the animals hear (the sound resulting from) their punishment." Since then I always saw him seeking refuge with Allah from the punishment of the grave in his prayers.  

دَخَلَتْ عَلَىَّ عَجُوزَانِ مِنْ عُجُزِ يَهُودِ الْمَدِينَةِ فَقَالَتَا لِي إِنَّ أَهْلَ الْقُبُورِ يُعَذَّبُونَ فِي قُبُورِهِمْ فَكَذَّبْتُهُمَا وَلَمْ أُنْعِمْ أَنْ أُصَدِّقَهُمَا فَخَرَجَتَا وَدَخَلَ عَلَىَّ النَّبِيُّ ﷺ فَقُلْتُ لَهُ يَا رَسُولَ اللَّهِ إِنَّ عَجُوزَيْنِ وَذَكَرْتُ لَهُ فَقَالَ صَدَقَتَا إِنَّهُمْ يُعَذَّبُونَ عَذَابًا تَسْمَعُهُ الْبَهَائِمُ كُلُّهَا فَمَا رَأَيْتُهُ بَعْدُ فِي صَلاَةٍ إِلاَّ تَعَوَّذَ مِنْ عَذَابِ الْقَبْرِ