وَعَنْ اِبْنِ عَبَّاسٍ رضى الله عنه
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«أَلَا وَإِنِّي نُهِيتُ أَنْ أَقْرَأَ اَلْقُرْآنَ رَاكِعًا أَوْ سَاجِدًا، فَأَمَّا اَلرُّكُوعُ فَعَظِّمُوا فِيهِ اَلرَّبَّ، وَأَمَّا اَلسُّجُودُ فَاجْتَهِدُوا فِي اَلدُّعَاءِ، فَقَمِنٌ أَنْ يُسْتَجَابَ لَكُمْ»
The Messenger of Allah (sallallahu alayhi wa sallam) said: “I have been forbidden to recite the Qur’an while bowing or prostrating; so while in the bowing (position) glorify (the Perfection of) the Rabb (Lord), and while in the prostrating (position) be earnest in supplication, for it is fitting that your supplications may be answered.”.
Bulugh al-Maram 355, Book 2, The Book of Prayer, Hadith 176. 1 min read