Sahih Muslim Book - 0, Hadith - 76

و حَدَّثَنَا مَحْمُودُ بْنُ غَيْلَانَ قَالَ قُلْتُ لِأَبِي دَاوُدَ الطَّيَالِسِيِّ قَدْ أَكْثَرْتَ عَنْ عَبَّادِ بْنِ مَنْصُورٍ فَمَا لَكَ لَمْ تَسْمَعْ مِنْهُ حَدِيثَ الْعَطَّارَةِ الَّذِي رَوَى لَنَا النَّضْرُ بْنُ شُمَيْلٍ قَالَ لِيَ اسْكُتْ فَأَنَا لَقِيتُ زِيَادَ بْنَ مَيْمُونٍ وَعَبْدَ الرَّحْمَنِ بْنَ مَهْدِيٍّ فَسَأَلْنَاهُ فَقُلْنَا لَهُ هَذِهِ الْأَحَادِيثُ الَّتِي تَرْوِيهَا عَنْ أَنَسٍ فَقَالَ أَرَأَيْتُمَا رَجُلًا يُذْنِبُ فَيَتُوبُ أَلَيْسَ يَتُوبُ اللَّهُ عَلَيْهِ؟ قَالَ قُلْنَا نَعَمْ قَالَ مَا سَمِعْتُ مِنْ أَنَسٍ مِنْ ذَا قَلِيلًا وَلَا كَثِيرًا إِنْ كَانَ لَا يَعْلَمُ النَّاسُ فَأَنْتُمَا لَا تَعْلَمَانِ أَنِّي لَمْ أَلْقَ أَنَسًا قَالَ أَبُو دَاوُدَ فَبَلَغَنَا بَعْدُ أَنَّهُ يَرْوِي فَأَتَيْنَاهُ أَنَا وَعَبْدُ الرَّحْمَنِ فَقَالَ أَتُوبُ ثُمَّ كَانَ بَعْدُ يُحَدِّثُ فَتَرَكْنَاهُ.

Mahmud bin Ghailan narrated to me, he said: "I said to Abu Dawud At-Tayalisi: 'You have narrated a great deal from 'Abbad bin Mansur. How come you did not hear from him the Hadith of Al-'Attarah which was narrated to us by An-Nadr bin Shumail?' He said to me: 'Be quiet! 'Abdur-Rahman bin Mahdi and I met Ziyad bin Maimun and we asked him. We said to him: "What are these Ahadith that you narrate from Anas?" He said: "What do you think of a man who commits a sin then repents; doesn't Allah accept his repentance?" We said: "Yes.'' He said: "I did not hear either a little or a lot from Anas (meaning, nothing at all). If the people do not know, then you now know that I did not meet Anas." Abu Dawud said: "After that, I heard that he was narrating and 'Abdur-Rahman and I went to him and he said: 'I repent.' Then after that he was narrating again, so we ignored him."