Sunan Abi Dawud, Book 8, Hadith 1460 (USC-MSA) ⓘ
Qatadah said: I asked Anas about the recitation of the Qur'an by the Prophet. He said: He used to express all the long accents clearly.
حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا جَرِيرٌ، عَنْ قَتَادَةَ، قَالَ سَأَلْتُ أَنَسًا عَنْ قِرَاءَةِ النَّبِيِّ، صلى الله عليه وسلم فَقَالَ كَانَ يَمُدُّ مَدًّا .
also referenced under: Hadith 1465 (DarusSalam) & Hadith 1460 (Hasan)