حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا جَرِيرٌ، عَنْ قَتَادَةَ، قَالَ سَأَلْتُ أَنَسًا عَنْ قِرَاءَةِ النَّبِيِّ، صلى الله عليه وسلم فَقَالَ كَانَ يَمُدُّ مَدًّا ‏.‏

Qatadah said: I asked Anas about the recitation of the Qur'an by the Prophet (PBUH). He said: He used to express all the long accents clearly. Translation Not Available

Book Ref: Sunan Abi Dawud Book 8 Hadith 1465
Web Ref:  Sunan Abi Dawud Book 8 Hadith 1460