The Prophet (ﷺ) prayed for Ibn 'Abbaas (RA):
اَللَّهُمَّ فَقِّهْهُ فِي الدِّيْنِ
Pronunciation
Allaahumma faqqih-hu fid deen
Meaning
O Allah! Make him a learned scholar in religion (Islam).
Source: Bukhari: 143
Read the hadith
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا هَاشِمُ بْنُ الْقَاسِمِ، قَالَ حَدَّثَنَا وَرْقَاءُ، عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي يَزِيدَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم دَخَلَ الْخَلاَءَ، فَوَضَعْتُ لَهُ وَضُوءًا قَالَ " مَنْ وَضَعَ هَذَا ". فَأُخْبِرَ فَقَالَ " اللَّهُمَّ فَقِّهْهُ فِي الدِّينِ ".
Narrated Ibn `Abbas: Once the Prophet (ﷺ) entered a lavatory and I placed water for his ablution. He asked, "Who placed it?" He was informed accordingly and so he said, "O Allah! Make him (Ibn `Abbas) a learned scholar in religion (Islam). [Bukhari: 143]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset