عَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَقِيمُوا الرُّكُوعَ وَالسُّجُودَ فَوَاللَّهِ إِنِّي لأَرَاكُمْ من بعدِي»

Ibn ‘Abbas reported God’s Messenger as saying, “I have been prohibited to recite the Qur’an when bowing or prostrating myself; so when bowing magnify the Lord, and when prostrating yourselves be earnest in supplication, for it is fitting that your supplications should be answered.’’ Muslim transmitted it.