Al-Adab Al-Mufrad #620
Supplication
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا أَحْمَدُ بْنُ عَبْدِ اللهِ، قَالَ: حَدَّثَنَا ابْنُ نُمَيْرٍ، عَنْ مَالِكِ بْنِ مِغْوَلٍ، عَنِ ابْنِ سُوقَةَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ قَالَ: إِنْ كُنَّا لَنَعُدُّ فِي الْمَجْلِسِ لِلنَّبِيِّ صلى الله عليه وسلم: رَبِّ اغْفِرْ لِي، وَتُبْ عَلَيَّ، إِنَّكَ أَنْتَ التَّوَّابُ الرَّحِيمُ مِئَةَ مَرَّةٍ.
Ibn 'Umar said, "We used to say this a hundred times in the assembly
of the Prophet, may Allah bless him and grant him peace, 'O Lord, forgive
me and turn back to me (forgive me). You are the Ever-Turning back (to his slaves), the Merciful.'"
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About Al-Adab Al-Mufrad
This hadith is #620 from Al-Adab Al-Mufrad, in the Book of Supplication.