Malik related to me from Nuaym ibn Abdullah ibn al-Mujmir fromAIi ibn Yahya az-Zuraqi from his father that Rifaa ibn Rafi said, "Oneday we were praying behind the Messenger of Allah, may Allah bless himand grant him peace, when the Messenger of Allah, may Allah bless himand grant him peace, raised his head from ruku and said, 'Allah hearsthe one who praises Him' (Sami Allahu liman hamidah). A man behind himsaid, 'Our Lord, praise belongs to you - blessed, pure and abundantpraise' (Rabbana wa laka'l hamd, hamdan kathiran tayiban mubarakan fihi). Whenthe Messenger of Allah, may Allah bless him and grant him peace, hadfinished, he said, 'Who was it who spoke just now?' The man said, 'Idid, Messenger of Allah,' and the Messenger of Allah, may Allah blesshim and grant him peace, said, 'I saw more than thirty angels rushingto it to see which one of them would record it first.' "
USC-MSA web (English) reference: Book 15, Hadith 25
Arabic reference: Book 15, Hadith 497