Teach me a du'aʿ that I may say in my prayer. He said: ʿSay: O Allah. I have wronged myself greatly and no one forgives sins except You, so grant me forgiveness from You and have mercy on me, for You are the Oft-Forgiving, Most Merciful.ʿ (Using translation from Aḥmad 28)
أَنَّهُ قَالَ لِرَسُولِ اللهِ ﷺ عَلِّمْنِي دُعَاءً أَدْعُو بِهِ فِي صَلَاتِي قَالَ قُلْ اللهُمَّ إِنِّي ظَلَمْتُ نَفْسِي ظُلْمًا كَثِيرًا وَلَا يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ فَاغْفِرْ لِي مَغْفِرَةً مِنْ عِنْدَكَ وَارْحَمْنِي إِنَّكَ أَنْتَ الْغَفُورُ الرَّحِيمُ لَفْظُهُمَا سَوَاءٌ