Ṣaḥīḥ reporting in supplication and praising Allah the almighty

«اللَّهُمَّ رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً، وَفِي الآخِرَةِ حَسَنَةً، وَقِنَا عَذَابَ النَّارِ»
{وهو أكثر دعاء النبي صلى الله عليه وسلم}

Allahumma rabbana ātinā fī d-dunyā ḥasanatan, wa fī l-ākhirati ḥasanatan, wa qinā ‘adhāba n-nār

“O Allah, our Lord, grant us good in this world, good in the Hereafter, and protect us from the punishment of the Fire.”

(This is the most frequently recited supplication of the Prophet (PBUH).)