Narrated Sa`d: Seek refuge with Allah by saying the words which the Prophet (ﷺ) used to say while seeking refuge with Allah, "0 Allah! I seek refuge with You from cowardice, and seek refuge with You from miserliness, and seek refuge with You from reaching a degraded geriatric old age, and seek refuge with You from the afflictions of the world and from the punishment in the grave."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا الْحُسَيْنُ، عَنْ زَائِدَةَ، عَنْ عَبْدِ الْمَلِكِ، عَنْ مُصْعَبٍ، عَنْ أَبِيهِ، قَالَ تَعَوَّذُوا بِكَلِمَاتٍ كَانَ النَّبِيُّ صلى الله عليه وسلم يَتَعَوَّذُ بِهِنَّ " اللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْجُبْنِ، وَأَعُوذُ بِكَ مِنَ الْبُخْلِ، وَأَعُوذُ بِكَ مِنْ أَنْ أُرَدَّ إِلَى أَرْذَلِ الْعُمُرِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الدُّنْيَا، وَعَذَابِ الْقَبْرِ ".
sunnah.com