It was narrated that 'Amr bin Maimun Al-Awdi said:

"Sa'd used to teach his children these words as a teacher teaches his students, and he said that the Messenger of Allah [ﷺ] used to seek refuge by means of them at the end of every prayer: 'Allahumma inni a'udhu bika minal-bukhli, wa a'udhu bika minal-jubni, wa a'udhu bika an uradda ila ardhalil-'umuri, wa a'udhu bika min fitnatid-dunya, wa a'udhu bika min 'adhabil-qabr (O Allah, I seek refuge with You from miserliness, and I seek refuge in You from cowardice, and I seek refuge in You from reaching the age of senility, and I seek refuge in You from the trials of this world, and I seek refuge in You from the torment of the grave.) So I narrated that to Mus'ab and he said that he told the truth."

أَخْبَرَنَا يَحْيَى بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا حَبَّانُ بْنُ هِلاَلٍ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ عَمْرِو بْنِ مَيْمُونٍ الأَوْدِيِّ، قَالَ كَانَ سَعْدٌ يُعَلِّمُ بَنِيهِ هَؤُلاَءِ الْكَلِمَاتِ كَمَا يُعَلِّمُ الْمُعَلِّمُ الْغِلْمَانَ وَيَقُولُ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَتَعَوَّذُ بِهِنَّ دُبُرَ الصَّلاَةِ ‏

‏ اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْبُخْلِ وَأَعُوذُ بِكَ مِنَ الْجُبْنِ وَأَعُوذُ بِكَ أَنْ أُرَدَّ إِلَى أَرْذَلِ الْعُمُرِ وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الدُّنْيَا وَأَعُوذُ بِكَ مِنْ عَذَابِ الْقَبْرِ ‏

‏ ‏.‏ فَحَدَّثْتُ بِهَا مُصْعَبًا فَصَدَّقَهُ ‏.‏