Sahih al-Bukhari 5045

Arabic

حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا جَرِيرُ بْنُ حَازِمٍ الأَزْدِيُّ، حَدَّثَنَا قَتَادَةُ، قَالَ سَأَلْتُ أَنَسَ بْنَ مَالِكٍ عَنْ قِرَاءَةِ النَّبِيِّ، صلى الله عليه وسلم فَقَالَ كَانَ يَمُدُّ مَدًّا‏.‏

English translation

Narrated Qatada:I asked Anas bin Malik about the recitation of the Prophet. He said, "He used to pray long (certain sounds) very much

Reference: Sahih al-Bukhari 5045, Book of Virtues of the Qur'an. English translation by Dr. Muhammad Muhsin Khan.