The Book of The At-Tatbiq (Clasping One's Hands Together)
12/7. Chapter:
The prohibition of reciting Qur'an while bowing
Sunan an-Nasai
أَخْبَرَنَا الْحَسَنُ بْنُ دَاوُدَ الْمُنْكَدِرِيُّ، قَالَ حَدَّثَنَا ابْنُ أَبِي فُدَيْكٍ، عَنِ الضَّحَّاكِ بْنِ عُثْمَانَ، عَنْ إِبْرَاهِيمَ بْنِ حُنَيْنٍ، عَنْ أَبِيهِ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، عَنْ عَلِيٍّ، قَالَ نَهَانِي رَسُولُ اللَّهِ صلى الله عليه وسلم وَلاَ أَقُولُ نَهَاكُمْ عَنْ تَخَتُّمِ الذَّهَبِ وَعَنْ لُبْسِ الْقَسِّيِّ وَعَنْ لُبْسِ الْمُفَدَّمِ وَالْمُعَصْفَرِ وَعَنِ الْقِرَاءَةِ فِي الرُّكُوعِ .
It was narrated that Ali said: "The Messenger of Allah (ﷺ) forbade me-but I do not say he forbade you- from wearing gold rings, Al-Qassi, and from wearing Al-Mufaddam, and from wearing clothes dyed with safflower, and from reciting Qur'an when bowing."
Reference : Sunan an-Nasa'i 1042In-book reference : Book 12, Hadith 14English translation : Vol. 2, Book 12, Hadith 1043