Revelation 13:16-18

New Revised Standard Version, Anglicised Catholic Edition

¹⁶ Also it causes all, both small and great, both rich and poor, both free and slave, to be marked on the right hand or the forehead, ¹⁷ so that no one can buy or sell who does not have the mark, that is, the name of the beast or the number of its name. ¹⁸ This calls for wisdom: let anyone with understanding calculate the number of the beast, for it is the number of a person. Its number is six hundred and sixty-six.^[a]