Sahih Bukhari

Narrated `Abdullah bin Mas`ud:The Prophet (ﷺ) recited Surat an-Najm (53) 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.