Hadith 31:79
Sahih (Al-Albani)
Anas said, "The most frequent supplication of the Prophet, may Allah bless him and grant him peace, was, 'O Allah, give us good in this world and good in the Next World and protect us from the punishment of the Fire.'"
حَدَّثَنَا مُسَدَّدٌ، قَالَ: حَدَّثَنَا عَبْدُ الْوَارِثِ، عَنْ عَبْدِ الْعَزِيزِ، عَنْ أَنَسٍ قَالَ: كَانَ أَكْثَرُ دُعَاءِ النَّبِيِّ صلى الله عليه وسلم: اللَّهُمَّ آتِنَا فِي الدُّنْيَا حَسَنَةً، وَفِي الْآخِرَةِ حَسَنَةً، وَقِنَا عَذَابَ النَّارِ
Original Reference: Al-Adab Al-Mufrad 682