صَحِيحُ مُسْلِمٍ
Sahih Muslim 822 e
The Book of Prayer - Travellers
Slow, measured pace of recitation (tartil), and to not rush when reciting, and the permissibility of reciting two or more surahs in one rak`ah
حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، حَدَّثَنَا حُسَيْنُ بْنُ عَلِيٍّ الْجُعْفِيُّ، عَنْ زَائِدَةَ، عَنْ مَنْصُورٍ، عَنْ شَقِيقٍ، قَالَ جَاءَ رَجُلٌ مِنْ بَنِي بَجِيلَةَ يُقَالُ لَهُ نَهِيكُ بْنُ سِنَانٍ إِلَى عَبْدِ اللَّهِ فَقَالَ إِنِّي أَقْرَأُ الْمُفَصَّلَ فِي رَكْعَةٍ . فَقَالَ عَبْدُ اللَّهِ هَذًّا كَهَذِّ الشِّعْرِ لَقَدْ عَلِمْتُ النَّظَائِرَ الَّتِي كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَقْرَأُ بِهِنَّ سُورَتَيْنِ فِي رَكْعَةٍ .
Shaqiq reported: A person from Banu Bajila who was called Nabik b. Sinan came to Abdullah and said: I recite mufassal surahs in one rak'ah. Upon this 'Abdullah said: (You recite) like the recitation of poetry. I know the manner in which the Messenger of Allah (ﷺ) recited two surahs in one rak'ah.
Sahih Muslim, 822 eSahihصحيح