Abū Naṣr Muḥammad b. Aḥmad b. ʿUmar al-Khaffāf > Aḥmad b. Salamah > Muḥammad b. Bashhār > Abū Dāwud > Hammām > Qatādah > ʿIkrimah > Ibn ʿAbbās

There were ten qarn (generations) between Nūḥ and Ādam. They were all upon the True Shariʿah then they differed ˹thereafter.˺ Then Allah sent Prophets to give glad tidings and warnings. ˹Ibn ʿAbbās˺ said: this is how it is in the recitation of ʿAbdullāh ˹b. Masʿūd˺: "The people were all one ummah (nation) and they then differed..." This ḥadīth is ṣaḥīḥ according to the criteria of Bukhārī but he did not collect it. – Sound Chain per Bukhārī

أَخْبَرَنِي أَبُو نَصْرٍ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ عُمَرَ الْخَفَّافُ ثنا أَحْمَدُ بْنُ سَلَمَةَ ثنا مُحَمَّدُ بْنُ بَشَّارٍ ثنا أَبُو دَاوُدَ ثنا هَمَّامٌ عَنْ قَتَادَةَ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ قَالَ

«كَانَ بَيْنَ نُوحٍ وَآدَمَ عَشَرَةُ قُرُونٍ كُلُّهُمْ عَلَى شَرِيعَةٍ مِنَ الْحَقِّ فَاخْتَلَفُوا فَبَعَثَ اللَّهُ النَّبِيِّينَ مُبَشِّرِينَ وَمُنْذِرِينَ» قَالَ وَكَذَلِكَ فِي قِرَاءَةِ عَبْدِ اللَّهِ «كَانَ النَّاسُ أُمَّةً وَاحِدَةً فَاخْتَلَفُوا» هَذَا حَدِيثٌ صَحِيحٌ عَلَى شَرْطِ الْبُخَارِيِّ وَلَمْ يُخَرِّجَاهُ على شرط البخاري – على شرط البخاري