Revelation 13:17
And 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.
More from Revelation 13
And I stood upon the sand of the sea, and saw a beast rise up out of the sea, having seven heads and ten horns, and upon his horns ten crowns, and upon his heads the name of blasphemy.
And the beast which I saw was like unto a leopard, and his feet were as the feet of a bear, and his mouth as the mouth of a lion: and the dragon gave him his power, and his seat, and great authority.
And I saw one of his heads as it were wounded to death; and his deadly wound was healed: and all the world wondered after the beast.
And they worshipped the dragon which gave power unto the beast: and they worshipped the beast, saying, Who is like unto the beast? who is able to make war with him?
And there was given unto him a mouth speaking great things and blasphemies; and power was given unto him to continue forty and two months.