Sunan an-Nasa'i, Book 50, Hadith 52 (In-Book) ⓘ

It was narrated that Mus'ab bin Sa'd and 'Amr bin Maimun Al-Awdi said: "Sa'd used to teach his children these words as a teacher teaches his students, and he would say that the Messenger of Allah [SAW] used to seek refuge (with Allah) with these words at the end of every prayer: 'Allahumma inni a'udhu bika minal-bukhli, wa a'udhu bika mnal-jubni, wa a'udhu bika an uradda ila ardhalil-'umuri, wa a'udhu bika min fitnatid-dunya, wa min 'adhabil-qabr (O Allah, I seek refuge with You from miserliness, and I seek refuge with You from cowardice, and I seek refuge with You from reaching the age of senility, and I seek refuge with You from the trials of this life and the torment of the grave.)'"

أَخْبَرَنِي هِلاَلُ بْنُ الْعَلاَءِ، قَالَ حَدَّثَنَا أَبِي قَالَ، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ إِسْرَائِيلَ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ مُصْعَبِ بْنِ سَعْدٍ، وَعَمْرِو بْنِ مَيْمُونٍ الأَوْدِيِّ، قَالاَ كَانَ سَعْدٌ يُعَلِّمُ بَنِيهِ هَؤُلاَءِ الْكَلِمَاتِ كَمَا يُعَلِّمُ الْمُكْتِبُ الْغِلْمَانَ وَيَقُولُ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَتَعَوَّذُ بِهِنَّ فِي دُبُرِ كُلِّ صَلاَةٍ ‏ "‏ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْبُخْلِ وَأَعُوذُ بِكَ مِنَ الْجُبْنِ وَأَعُوذُ بِكَ مِنْ أَنْ أُرَدَّ إِلَى أَرْذَلِ الْعُمُرِ وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الدُّنْيَا وَعَذَابِ الْقَبْرِ ‏" ‏ ‏.‏