ENOfficial
Ibn ‘Abbas reported God’s messenger as stating that God has said, “If anyone knows that I have power to forgive sins I will pardon him and not care, so long as he associatesi nothing with me.” It is transmitted in Sharh as-sunna.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا عَنِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: " قَالَ اللَّهُ تَعَالَى: مَنْ عَلِمَ أَنِّي ذُو قُدْرَةٍ عَلَى مَغْفِرَةِ الذُّنُوبِ غَفَرْتُ لَهُ وَلَا أُبَالِي مَا لم تشرك بِي شَيْئا ". رَوَاهُ فِي شرح السّنة
sunnah.com