رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الْآخِرَةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ
Transliteration
Rabbana atina fid-dunya hasanatan wa fil-akhirati hasanatan wa qina 'adhaban-nar
English meaning
Our Lord, give us in this world that which is good and in the Hereafter that which is good, and save us from the punishment of the Fire.
When is it recited?
At the end of every supplication.
Source
Al-Baqarah 2/201