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

Rifa'a b. Raf’i said

We were praying behind the Prophet, and when he raised his head at the end of the rak'a he said, “God listens to him who praises Him.” A man behind him said, ‘O our Lord, to Thee be the praise, abundant, good, blessed, sufficient.” When he ended he asked, “Who was the speaker just now ?” and when the man replied that he had spoken he said, “I saw over thirty angels racing one another to be the first to record it.” Bukhari transmitted it.