Ash-Shama'il Al-Muhammadiyah, Book 44, Hadith 314 (In-Book)

Ya'laa bin Mamlak Radiyallahu 'Anhu says: "He asked Ummul Mu'mineen Sayyiditina Ummi Salamah Radiyallahu 'Anha about the recital of Rasulullah Sallallahu 'Alayhi Wasallam". She replied: "He recited every word separately and clearly".

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ‏:‏ حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ أَبِي مُلَيْكَةَ، عَنْ يَعَلَى بْنِ مَمْلَكٍ، أَنَّهُ سَأَلَ أُمَّ سَلَمَةَ، عَنْ قِرَاءَةِ رَسُولِ اللهِ صلى الله عليه وسلم، فَإِذَا هِيَ تَنْعَتُ قِرَاءَةً مُفَسَّرَةً حَرْفًا حَرْفًا‏.‏

also referenced under: Book 43, Hadith 297 (English)