كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 293
Narrated Ibn 'Abbas (RA):
Allah's Messenger (ﷺ) 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." [Reported by Muslim].
وَعَنْ اِبْنِ عَبَّاسٍ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ أَلَا وَإِنِّي نُهِيتُ أَنْ أَقْرَأَ اَلْقُرْآنَ رَاكِعًا أَوْ سَاجِدًا , فَأَمَّا اَلرُّكُوعُ فَعَظِّمُوا فِيهِ اَلرَّبَّ , وَأَمَّا اَلسُّجُودُ فَاجْتَهِدُوا فِي اَلدُّعَاءِ , فَقَمِنٌ أَنْ يُسْتَجَابَ لَكُمْ } رَوَاهُ مُسْلِمٌ 1
Reference : Bulugh al-Maram 293
In-book reference : Book 2, Hadith 293
English translation : Book 2, Hadith 291
Hadith Text
Reference