عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((أَلَا إِنِّي نُهِيتُ أَنْ أَقْرَأَ رَاكِعًا أَوْ سَاجِدًا، فَأَمَّا الرُّكُوعُ فَعَظِّمُوا فِيهِ الرَّبَّ، وَأَمَّا السُّجُودُ فَاجْتَهِدُوا فِي الدُّعَاءِ فَقَمِنٌ أَنْ يُسْتَجَابَ لَكُمْ))
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Beware! Indeed, I have been forbidden from reciting (Qur'an) during bowing and prostration, therefore, in bowing, glorify your Lord, the Exalted, and in prostration, strive in supplication, for it is most likely that it will be accepted for you.