Sahih Bukhari
Fighting for the Cause of Allah (Jihaad)
Volume: 004 / Book Number: 052 / Hadith Number: 76
Narrated 'Amr bin Maimun Al-Audi:
Sad used to teach his sons the following words as a teacher teaches his students the skill of writing and used to say that Allah's Apostle used to seek Refuge with Allah from them (i.e. the evils) at the end of every prayer. The words are:
'O Allah! I seek refuge with You from cowardice, and seek refuge with You from being brought back to a bad stage of old life and seek refuge with You from the afflictions of the world, and seek refuge with You from the punishments in the grave.'