Abu Dawud Book 2, Hadith Number 1401.
Chapter : A view that there is prostration in mufassal suras.
Narated By ‘Abd Allah b. Mas’ud : The Apostle of Allah (PBUH) recited Surah al-Najm and prostrate himself. No one remained there who did not prostrate himself. A man from the people took a handful of pebbles or dust and raised it to his face saying: This is enough for me. ‘Abd Allah (b. Mas’ud) said: I later saw him killed as an infidel.