Language:
كتاب فضائل القرآن
66  
Virtues of the Qur'an
(28)
Chapter: The recitation of Qur'an in Tartil
(28)
باب التَّرْتِيلِ فِي الْقِرَاءَةِ
Sahih al-Bukhari 5043

Narrated Abu Wail:

We went to `Abdullah in the morning and a man said, "Yesterday I recited all the Mufassal Suras." On that `Abdullah said, "That is very quick, and we have the (Prophet's) recitation, and I remember very well the recitation of those Suras which the Prophet (ﷺ) used to recite, and they were eighteen Suras from the Mufassal, and two Suras from the Suras that start with Ha Mim.

حَدَّثَنَا أَبُو النُّعْمَانِ، حَدَّثَنَا مَهْدِيُّ بْنُ مَيْمُونٍ، حَدَّثَنَا وَاصِلٌ، عَنْ أَبِي وَائِلٍ، عَنْ عَبْدِ اللَّهِ، قَالَ غَدَوْنَا عَلَى عَبْدِ اللَّهِ فَقَالَ رَجُلٌ قَرَأْتُ الْمُفَصَّلَ الْبَارِحَةَ‏.‏ فَقَالَ هَذًّا كَهَذِّ الشِّعْرِ، إِنَّا قَدْ سَمِعْنَا الْقِرَاءَةَ وَإِنِّي لأَحْفَظُ الْقُرَنَاءَ الَّتِي كَانَ يَقْرَأُ بِهِنَّ النَّبِيُّ صلى الله عليه وسلم ثَمَانِيَ عَشْرَةَ سُورَةً مِنَ الْمُفَصَّلِ وَسُورَتَيْنِ مِنْ آلِ حم‏.‏
Reference : Sahih al-Bukhari 5043
In-book reference : Book 66, Hadith 67
USC-MSA web (English) reference : Vol. 6, Book 61, Hadith 563
  (deprecated numbering scheme)