Sahih al-Bukhari 3552
Narrated Abu 'Is-haq:
Al-Bara' was asked, "Was the face of the Prophet (as bright) as a sword?" He said, "No, but (as bright) 
as a moon."
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا زُهَيْرٌ، عَنْ أَبِي إِسْحَاقَ، قَالَ سُئِلَ الْبَرَاءُ أَكَانَ وَجْهُ النَّبِيِّ صلى الله عليه وسلم مِثْلَ السَّيْفِ قَالَ لاَ بَلْ مِثْلَ الْقَمَرِ‏.‏