Sunan Abi Dawud 788
سنن أبي داود#788Sahihحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَأَحْمَدُ بْنُ مُحَمَّدٍ الْمَرْوَزِيُّ، وَابْنُ السَّرْحِ، قَالُوا حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، - قَالَ قُتَيْبَةُ فِيهِ - عَنِ ابْنِ عَبَّاسٍ، قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم لاَ يَعْرِفُ فَصْلَ السُّورَةِ حَتَّى تُنَزَّلَ عَلَيْهِ { بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ } . وَهَذَا لَفْظُ ابْنِ السَّرْحِ .
Ibn Abbas said:The prophet (ﷺ) did not distinguish between the two surahs until the words “In the name of Allah, the Compassionate, the merciful” was revealed to him. These are the words of Ibn al-sarh
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 2:398