Hadithcore
Sahih Muslim, 586 b
sahih

Masruq reported this hadith on the authority of 'A'isha who said:

Never did he (the Prophet) say prayer after this in which I did not hear him seeking refuge from the torment of the grave.

حَدَّثَنَا هَنَّادُ بْنُ السَّرِيِّ، حَدَّثَنَا أَبُو الأَحْوَصِ، عَنْ أَشْعَثَ، عَنْ أَبِيهِ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ، بِهَذَا الْحَدِيثِ وَفِيهِ قَالَتْ وَمَا صَلَّى صَلاَةً بَعْدَ ذَلِكَ إِلاَّ سَمِعْتُهُ يَتَعَوَّذُ مِنْ عَذَابِ الْقَبْرِ ‏.‏

References2 variants
In-Book Reference
Book 5, Hadith 160
USC-MSA web (English) reference
Book 4, Hadith 1215 (deprecated numbering scheme)