Sahih al-Bukhari 2822

يُعَلِّمُ بَنِيهِ هَؤُلاَءِ الْكَلِمَاتِ كَمَا يُعَلِّمُ الْمُعَلِّمُ الْغِلْمَانَ الْكِتَابَةَ، وَيَقُولُ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَتَعَوَّذُ مِنْهُنَّ دُبُرَ الصَّلاَةِ ‏ "‏ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْجُبْنِ، وَأَعُوذُ بِكَ أَنْ أُرَدَّ إِلَى أَرْذَلِ الْعُمُرِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الدُّنْيَا، وَأَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ ‏"‏‏.‏ فَحَدَّثْتُ بِهِ مُصْعَبًا فَصَدَّقَهُ‏.

“Sa`d used to teach his sons the following words as a teacher teaches his students the skill of writing and used to say that Allah's Messenger ﷺ used to seek Refuge with Allah from them (i.e. the evils) at the end of every prayer. The words are: 'O Allah! I seek refuge with You from cowardice, and seek refuge with You from being brought back to a bad stage of old life and seek refuge with You from the afflictions of the world, and seek refuge with You from the punishments in the grave”