Sahih Bukhari
Prostration During Recital of Quran
Volume: 002 / Book Number: 019 / Hadith Number: 173
Narrated 'Abdullah bin Masud :
The Prophet recited Suratan-Najm (103) at Mecca and prostrated while reciting it and those who were with him did the same except an old man who took a handful of small stones or earth and lifted it to his forehead and said, "This is sufficient for me." Later on, I saw him killed as a non-believer.