Sahih Bukhari Volume 5, Book 64, Hadith 3974

حَدَّثَنَا عَبْدَانُ بْنُ عُثْمَانَ، قَالَ أَخْبَرَنِي أَبِي، عَنْ شُعْبَةَ، عَنْ أَبِي إِسْحَاقَ، عَنِ الأَسْوَدِ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَرَأَ ‏{‏وَالنَّجْمِ‏}‏ فَسَجَدَ بِهَا، وَسَجَدَ مَنْ مَعَهُ، غَيْرَ أَنَّ شَيْخًا أَخَذَ كَفًّا مِنْ تُرَابٍ فَرَفَعَهُ إِلَى جَبْهَتِهِ فَقَالَ يَكْفِينِي هَذَا‏.‏ قَالَ عَبْدُ اللَّهِ فَلَقَدْ رَأَيْتُهُ بَعْدُ قُتِلَ كَافِرًا‏

Narrated By 'Abdullah : The Prophet recited Surat-an-Najm and then prostrated himself, and all who were with him prostrated too. But an old man took a handful of dust and touched his forehead with it saying, "This is sufficient for me." Later on I saw him killed as an infidel.