Narrated Abdullah ibn Umar (RA): We counted that the Messenger of Allah (ﷺ) would say this dua a hundred times during a meeting -
رَبِّ اغْفِرْ لِي وَتُبْ عَلَيَّ إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ (الْغَفُوْرُ)
Pronunciation
Rabbighfirli Watub Alayya Innaka Antat-Tawwabul- rahim [in another narration there is al-Ghaffur instead of al-Rahim]
Meaning
Lord, forgive me and repent for me, for you are The Most Merciful The Acceptor of Repentance. In another narration there is "The Forgiver" instead of "The Acceptor of Repentance"
Source: Sahih. Abu Dawud: 1516
Read the hadith
حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ مَالِكِ بْنِ مِغْوَلٍ، عَنْ مُحَمَّدِ بْنِ سُوقَةَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ إِنْ كُنَّا لَنَعُدُّ لِرَسُولِ اللَّهِ صلى الله عليه وسلم فِي الْمَجْلِسِ الْوَاحِدِ مِائَةَ مَرَّةٍ " رَبِّ اغْفِرْ لِي وَتُبْ عَلَىَّ إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ " .
Narrated Abdullah ibn Umar: We counted that the Messenger of Allah (ﷺ) would say a hundred times during a meeting: "My Lord, forgive me and pardon me; Thou art the Pardoning and forgiving One". [Sahih (Albani). Abu Dawud: 1516]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset