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.
Source: sunnah.com
Other translations
Arabic
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.
sunnah.com