Reference : Hisn al-Muslim 60

اللّهُـمَّ إِنِّـي أَعوذُ بِكَ مِنَ البُخْـل، 
وَأَعوذُ بِكَ مِنَ الجُـبْن، 
وَأَعوذُ بِكَ مِنْ أَنْ أُرَدَّ إِلى أَرْذَلِ الـعُمُر،
وَأََعوذُ بِكَ مِنْ فِتْنَـةِ الدُّنْـيا وَعَـذابِ القَـبْر
Allāhumma 'innī ‘a`udhu bika mina ‘l-bukhl, 
wa ‘a`udhu bika mina ‘l-jubn,
wa ‘a`udhu bika min ‘an ‘uradda ilā ‘ardhali ‘l-`umur, 
wa ‘a`udhu bika min fitnatid-dunyā wa `adhābi ‘l-qabr.


O Allah, I seek Your protection from miserliness, 
I seek Your protection from cowardice, 
and I seek Your protection from being returned to feeble old age. 
I seek Your protection from the trials of this world and from the torment of the grave.

Reference:
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 6/35

Chapter: After the last tashahhud and before salam