Revelation 13

The Mark of the Beast

16 And the second beast required all people, small and great, rich and poor, free and slave, to receive a mark on their right hand or on their forehead, 17 so that no one could buy or sell unless he had the mark — the name of the beast or the number of its name.

18 Here is a call for wisdom: Let the one who has insight calculate the number of the beast, for it is the number of a man, and that number is 666.*13:18 Some manuscripts 616