Rabbanā ātinā — the universal duʿāʾ
Any time
Arabic
رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الآخِرَةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ
Transliteration
Rabbanā ātinā fī ad-dunyā ḥasanatan wa fī al-ākhirati ḥasanatan wa qinā ʿadhāba an-nār.
English
"Our Lord, give us good in this world, and good in the Hereafter, and save us from the punishment of the Fire."
Source: Qurʾan 2:201
Context
The duʿāʾ the Prophet ﷺ made most often — simple, complete.