Virtues of the Qur'an
66/29. Chapter:
Prolonging certain sounds while reciting the Qur'an
Sahih Bukhari
حَدَّثَنَا عَمْرُو بْنُ عَاصِمٍ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ سُئِلَ أَنَسٌ كَيْفَ كَانَتْ قِرَاءَةُ النَّبِيِّ صلى الله عليه وسلم. فَقَالَ كَانَتْ مَدًّا. ثُمَّ قَرَأَ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ، يَمُدُّ بِبِسْمِ اللَّهِ، وَيَمُدُّ بِالرَّحْمَنِ، وَيَمُدُّ بِالرَّحِيمِ.
Narrated Qatada: Anas was asked, "How was the recitation (of the Qur'an) of the Prophet?' He replied, "It was characterized by the prolongation of certain sounds." He then recited: In the Name of Allah, the Most Beneficent, the Most Merciful prolonging the pronunciation of 'In the Name of Allah, 'the most Beneficent,' and 'the Most Merciful.
Reference : Sahih al-Bukhari 5046In-book reference : Book 66, Hadith 70USC-MSA web (English) reference : Vol. 6, Book 61, Hadith 566