Sahih Bukhari Volume 5, Book 58, Hadith Number 192.

Narated By ‘Abdullah : The Prophet recited Surat An-Najam and prostrated, and there was nobody who did not prostrate then except a man whom I saw taking a handful of pebbles, lifting it, and prostrating on it. He then said, “This is sufficient for me.” No doubt I saw him killed as a disbeliever afterwards.