Anas reported that the Prophet, peace be upon him, used to supplicate, “O Allah, there is no ease except what You make easy, and you alone can turn a difficulty into ease.” (Ibn As-sinni)
Source: Fiqh-us-Sunnah, Volume 4, #131
رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الآخِرَةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ