Revelation 13:15-17

15It was permitted to give breath to the image of the beast, so that the image of the beast could both speak and cause whoever would not worship the image of the beast to be killed.

16And it makes everyone — small and great, rich and poor, free and slave — to receive a mark on his right hand or on his forehead,

17so that no one can buy or sell unless he has the mark: the beast’s name or the number of its name.