بُلُوغُ الْمَرَامِ
Bulugh al-Maram 322
The Book of Prayer
وَعَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ - رضى الله عنه - قَالَ : { إِنَّ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -كَانَ يَتَعَوَّذُ بِهِنَّ دُبُرَ اَلصَّلَاةِ : " اَللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ اَلْبُخْلِ وَأَعُوذُ بِكَ مِنْ اَلْجُبْنِ , وَأَعُوذُ بِكَ مِنْ أَنْ أُرَدَّ إِلَى أَرْذَلِ اَلْعُمُرِ , وَأَعُوذُ بِكَ مِنْ فِتْنَةِ اَلدُّنْيَا , وَأَعُوذُ بِكَ مِنْ عَذَابِ اَلْقَبْرِ } رَوَاهُ اَلْبُخَارِيُّ . [1]
Narrated Sa'd bin Abi Waqqas (RA): Allah's Messenger (ﷺ) used to seek Allah's protection by invoking this supplication (Du'a) at the end of every Salat (prayer): "O Allah, I seek refuge in You from stinginess, I seek refuge in You from cowardice, I seek refuge in You from old age (and senility), I seek refuge in You from the temptation of the world and I seek refuge in You from the punishment in the grave." [Reported by al-Bukhari].
Sunnah.com reference: Book 2, Hadith 215