Prayer (Kitab Al-Salat): Prostration while reciting the Qur'an
7/5. Chapter:
The Prostration In Surah Sad
Sunan Abi Dawud
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا أَيُّوبُ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، قَالَ لَيْسَ { ص } مِنْ عَزَائِمِ السُّجُودِ وَقَدْ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَسْجُدُ فِيهَا .
Narrated Ibn 'Abbas: A prostration when reciting Sad is not one of those which are divinely commanded, but I have seen Messenger of Allah (ﷺ) prostrate himself.
Reference : Sunan Abi Dawud 1409In-book reference : Book 7, Hadith 9English translation : Book 7, Hadith 1404