حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عَبْدُ الْوَارِثِ، ح وَحَدَّثَنَا زِيَادُ بْنُ أَيُّوبَ، حَدَّثَنَا إِسْمَاعِيلُ، - الْمَعْنَى - عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، قَالَ سَأَلَ قَتَادَةُ أَنَسًا أَىُّ دَعْوَةٍ كَانَ يَدْعُو بِهَا رَسُولُ اللَّهِ صلى الله عليه وسلم أَكْثَرَ قَالَ كَانَ أَكْثَرُ دَعْوَةٍ يَدْعُو بِهَا ‏"‏ اللَّهُمَّ رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الآخِرَةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ ‏"‏ ‏.‏ وَزَادَ زِيَادٌ وَكَانَ أَنَسٌ إِذَا أَرَادَ أَنْ يَدْعُوَ بِدَعْوَةٍ دَعَا بِهَا وَإِذَا أَرَادَ أَنْ يَدْعُوَ بِدُعَاءٍ دَعَا بِهَا فِيهَا ‏.‏

Qatadah asked Anas: Which Supplication would the Prophet (PBUH) often make ? He replied: The supplication he would usually recite was: "O Allah, give us in this world what is good and in the next what is good, and protect us from the punishment of Hell-fire". The version of Ziyad adds: When Anas wished to supplicate, he uttered this supplication. When he uttered some other supplication, he combined it with this supplication. Translation Not Available

Book Ref: Sunan Abi Dawud Book 8 Hadith 1519
Web Ref:  Sunan Abi Dawud Book 8 Hadith 1514