Musnad Ahmad 26:256

Yazid narrated to us, Shu'bah informed us, from Abu Ishaq, from al-Aswad, from Abdullah, who said: "The Messenger of Allah (peace and blessings of Allah be upon him) prostrated in [Surah] an-Najm." There remained no one among the people except that he prostrated, except for an old man who took a handful of pebbles, raised them to his forehead, and said: "This suffices me." Abdullah said: "And I indeed saw him killed as a disbeliever."