Sahih al-Bukhari 6389
Narrated Anas:
The most frequent invocation of The Prophet (ﷺ) was: "O Allah! Give to us in the world that which is 
good and in the Hereafter that which is good, and save us from the torment of the Fire." (2.201)
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عَبْدُ الْوَارِثِ، عَنْ عَبْدِ الْعَزِيزِ، عَنْ أَنَسٍ، قَالَ كَانَ أَكْثَرُ دُعَاءِ النَّبِيِّ صلى الله عليه وسلم ‏
"‏ اللَّهُمَّ رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً، وَفِي الآخِرَةِ حَسَنَةً، وَقِنَا عَذَابَ النَّارِ ‏"‏‏.‏