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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
hakim:852 – Abū ʿAbdullāh Muḥammad b. Yaʿqūb b. Yūsuf al-Ḥāfiẓ > ʿAlī b. al-Ḥasan b. Abū ʿĪsá > ʿAmr b. ʿĀṣim al-Kilābī > Hammām And Jarīr > Qatādah

[Machine] Anas bin Malik was asked, "How was the recitation of the Messenger of Allah ﷺ ?" He said, "It was elongated. He would recite, 'In the name of Allah, the Most Gracious, the Most Merciful,' (Surah Al-Fatiha, verse 1) elongating 'the Most Gracious' and 'the Most Merciful.'"  

الحاكم:٨٥٢ – مَا حَدَّثَنَاهُ أَبُو عَبْدِ اللَّهِ مُحَمَّدُ بْنُ يَعْقُوبَ بْنِ يُوسُفَ الْحَافِظُ ثنا عَلِيُّ بْنُ الْحَسَنِ بْنِ أَبِي عِيسَى ثنا عَمْرُو بْنُ عَاصِمٍ الْكِلَابِيُّ ثنا هَمَّامٌ وَجَرِيرٌ قَالَا ثنا قَتَادَةُ قَالَ

سُئِلَ أَنَسُ بْنُ مَالِكٍ كَيْفَ كَانَ قِرَاءَةُ رَسُولِ اللَّهِ ﷺ؟ قَالَ كَانَتْ مَدًّا ثُمَّ قَرَأَ {بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ} [الفاتحة 1] يَمُدُّ الرَّحْمَنَ وَيَمُدُّ الرَّحِيمَ  

See similar narrations below:

Collected by Bukhārī, Bayhaqī
bukhari:5046 – ʿAmr b. ʿĀṣim > Hammām > Qatādah

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.  

البخاري:٥٠٤٦ – حَدَّثَنَا عَمْرُو بْنُ عَاصِمٍ حَدَّثَنَا هَمَّامٌ عَنْ قَتَادَةَ قَالَ

سُئِلَ أَنَسٌ كَيْفَ كَانَتْ قِرَاءَةُ النَّبِيِّ ﷺ فَقَالَ كَانَتْ مَدًّا ثُمَّ قَرَأَ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ يَمُدُّ بِبِسْمِ اللَّهِ وَيَمُدُّ بِالرَّحْمَنِ وَيَمُدُّ بِالرَّحِيمِ  

bayhaqi:2392 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū ʿAbdullāh Muḥammad b. Yaʿqūb b. Yūsuf al-Ḥāfiẓ > ʿAlī b. al-Ḥasan b. Abū ʿĪsá > ʿAmr b. ʿĀṣim al-Kilābī > Hammām And Jarīr > Qatādah > Suʾil

[Machine] Anas bin Malik was asked: "How was the recitation of the Messenger of Allah ﷺ?" He said: "It was measured, then he would recite: "In the name of Allah, the Most Gracious, the Most Merciful" [Surah Al-Fatiha, verse 1], elongating the word 'Ar-Rahman' (the Most Gracious) and 'Ar-Raheem' (the Most Merciful)."  

البيهقي:٢٣٩٢ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو عَبْدِ اللهِ مُحَمَّدُ بْنُ يَعْقُوبَ بْنِ يُوسُفَ الْحَافِظُ ثنا عَلِيُّ بْنُ الْحَسَنِ بْنِ أَبِي عِيسَى ثنا عَمْرُو بْنُ عَاصِمٍ الْكِلَابِيُّ ثنا هَمَّامٌ وَجَرِيرٌ قَالَا ثنا قَتَادَةُ قَالَ

سُئِلَ أَنَسُ بْنُ مَالِكٍ ؓ كَيْفَ كَانَتْ قِرَاءَةُ رَسُولِ اللهِ ﷺ؟ قَالَ كَانَتْ مَدًّا ثُمَّ قَرَأَ {بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيمِ} [الفاتحة 1] يَمُدُّ الرَّحْمَنِ وَيَمُدُّ الرَّحِيمِ  

رَوَاهُ الْبُخَارِيُّ فِي الصَّحِيحِ عَنْ عَمْرِو بْنِ عَاصِمٍ عَنْ هَمَّامٍ إِلَّا أَنَّهُ قَالَ يَمُدُّ بِسْمِ اللهِ وَيَمُدُّ الرَّحْمَنِ وَيَمُدُّ الرَّحِيمِ
bayhaqi:2393 – Abū Bakr b. al-Ḥārith al-Faqīh > ʿAlī b. ʿUmar al-Ḥāfiẓ > al-Ḥusayn b. Ismāʿīl > Abū Jaʿfar Muḥammad b. Aḥmad b. al-Junayd > ʿAmr b. ʿĀṣim > Hammām And Jarīr / Ibn Ḥāzim > Qatādah

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. (Using translation from Bukhārī 5046)   

البيهقي:٢٣٩٣ – وَأَخْبَرَنَا أَبُو بَكْرِ بْنُ الْحَارِثِ الْفَقِيهُ أنبأ عَلِيُّ بْنُ عُمَرَ الْحَافِظُ ثنا الْحُسَيْنُ بْنُ إِسْمَاعِيلَ ثنا أَبُو جَعْفَرٍ مُحَمَّدُ بْنُ أَحْمَدَ بْنِ الْجُنَيْدِ ثنا عَمْرُو بْنُ عَاصِمٍ ثنا هَمَّامٌ وَجَرِيرٌ يَعْنِي ابْنَ حَازِمٍ قَالَا ثنا قَتَادَةُ قَالَ

سُئِلَ أَنَسُ بْنُ مَالِكٍ كَيْفَ كَانَتْ قِرَاءَةُ رَسُولِ اللهِ ﷺ؟ قَالَ كَانَتْ مَدًّا ثُمَّ قَرَأَ بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيمِ يَمُدُّ بِسْمِ اللهِ وَيَمُدُّ الرَّحْمَنِ وَيَمُدُّ الرَّحِيمِ