Revelation 13:16-18

21st Century King James Version

¹⁶ And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand or in their foreheads,

¹⁷ that no man might buy or sell, save he that had the mark or the name of the beast or the number of his name.

¹⁸ Here is wisdom: Let him that hath understanding count the number of the beast, for it is the number of a man; and his number is six hundred threescore and six.