[Machine] The Prophet ﷺ used to not know the end of a chapter until the verse "In the name of Allah, the Most Gracious, the Most Merciful" was revealed.
كَانَ النَّبِيُّ ﷺ «لَا يَعْلَمُ خَتْمَ السُّورَةِ حَتَّى تَنْزِلَ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ»
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.
كَانَ النَّبِيُّ ﷺ لاَ يَعْرِفُ فَصْلَ السُّورَةِ حَتَّى تُنَزَّلَ عَلَيْهِ { بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ } وَهَذَا لَفْظُ ابْنِ السَّرْحِ
"The Prophet would open his Salat with (Bismillahir-Rahmanir-Rahim)."
كَانَ النَّبِيُّ ﷺ يَفْتَتِحُ صَلاَتَهُ بِ (بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ )
[Machine] Indeed, the Prophet ﷺ used to say "Bismillah ar-Rahman ar-Rahim" (In the name of Allah, the Most Gracious, the Most Merciful) when Jibril (Gabriel) ﷺ revealed to him a surah.
إِنَّ النَّبِيَّ ﷺ كَانَ إِذَا نَزَلَ جِبْرِيلُ عَلَيْهِ السَّلَامُ فَقَالَ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ عَلِمَ أَنَّهَا سُورَةٌ
[Machine] The Messenger of Allah ﷺ did not know the ending of the Surah until "In the name of Allah, the Most Gracious, the Most Merciful" was revealed to him.
«مَا كَانَ رَسُولُ اللهِ ﷺ يَعْرِفُ خَاتِمَةَ السُّورَةِ حَتَّى يُنَزَّلَ عَلَيْهِ بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيمِ»
[Machine] The Messenger of Allah ﷺ would not know the division of the surah (chapter) until "Bismillah Al-Rahman Al-Raheem" (In the name of Allah, the Most Gracious, the Most Merciful) would be revealed to him.
كَانَ رَسُولُ اللهِ ﷺ لَا يَعْرِفُ فَصْلَ السُّورَةِ حَتَّى تَنْزِلَ عَلَيْهِ بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيمِ
[Machine] He used to say that the reading begins with "In the name of Allah, the Most Gracious, the Most Merciful" [Surah Al-Fatiha 1].
كَانَ يَقُولُ تُفْتَتَحُ الْقِرَاءَةُ بِ {بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيمِ} [الفاتحة 1]