Revelation 13:16–18 (ASV 1901)

16And he causeth all, the small and the great, and the rich and the poor, and the free and the bond, that there be given them a mark on their right hand, or upon their forehead; 17and that no man should be able to buy or to sell, save he that hath the mark, even the name of the beast or the number of his name. 18Here is wisdom. He that hath understanding, let him count the number of the beast; for it is the number of a man: and his number is Six hundred and sixty and six.