The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness
حَدَّثَنَا ابْنُ نُمَيْرٍ، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ، وَأَبُو سَعِيدٍ الأَشَجُّ جَمِيعًا عَنْ حَفْصِ بْنِ، غِيَاثٍ عَنْ عَاصِمٍ، بِهَذَا الإِسْنَادِ نَحْوَهُ .This hadith has been narrated on the authority of 'Asim with the same chain of transmitters
From Sahih Muslim, whose reports the scholars accept as authentic.