Chapter 17: Prostration During Recital of Qur'an
Narrated 'Abdullah bin Mas 'ud: The Prophet (ﷺ) recited Surat-an-Najm (53) and prostrated while reciting it and all the people prostrated and a man amongst the people took a handful of stones or earth and raised it to his face and said, "This is sufficient for me. Later on I saw him killed as a non-believer."
Sahih al-Bukhari 1070