The Book of Prayer
Bulugh al-Maram #387
كتاب الصلاة
وَعَنْ أَبِي بَكْرٍ اَلصِّدِّيقِ - رضى الله عنه - "أَنَّهُ قَالَ لِرَسُولِ اَللَّهِ - صلى الله عليه وسلم -عَلِّمْنِي دُعَاءً أَدْعُو بِهِ فِي صَلَاتِي. قَالَ قُلْ: " اَللَّهُمَّ إِنِّي ظَلَمْتُ نَفْسِي ظُلْمًا كَثِيرًا, وَلَا يَغْفِرُ اَلذُّنُوبَ إِلَّا أَنْتَ, فَاغْفِرْ لِي مَغْفِرَةً مِنْ عِنْدِكَ, وَارْحَمْنِي, إِنَّكَ أَنْتَ اَلْغَفُورُ اَلرَّحِيمُ" مُتَّفَقٌ عَلَيْهِ.
Narrated Abu Bakr as-Siddiq (RA):
He said to Allah's Messenger (ﷺ), “Teach me a supplication to use in my prayer.” He (ﷺ) said: “Say: O Allah, I have greatly wronged myself, and no one forgives sins except You, so grant me forgiveness from You and have mercy on me, You are the Forgiving and the Merciful One.”
وَعَنْ أَبِي بَكْرٍ اَلصِّدِّيقِ - رضى الله عنه - "أَنَّهُ قَالَ لِرَسُولِ اَللَّهِ - صلى الله عليه وسلم -عَلِّمْنِي دُعَاءً أَدْعُو بِهِ فِي صَلَاتِي . قَالَ قُلْ : " اَللَّهُمَّ إِنِّي ظَلَمْتُ نَفْسِي ظُلْمًا كَثِيرًا , وَلَا يَغْفِرُ اَلذُّنُوبَ إِلَّا أَنْتَ , فَاغْفِرْ لِي مَغْفِرَةً مِنْ عِنْدِكَ , وَارْحَمْنِي , إِنَّكَ أَنْتَ اَلْغَفُورُ اَلرَّحِيمُ" مُتَّفَقٌ عَلَيْهِ .
He said to Allah's Messenger (ﷺ), "Teach me a supplication to use in my prayer." He (ﷺ) said: "Say: O Allah, I have greatly wronged myself, and no one forgives sins except You, so grant me forgiveness from You and have mercy on me, You are the Forgiving and the Merciful One."
— Bulugh al-Maram, Hadith 387