Revelation 13:17

17 so that they could not buy or sell unless they had the mark, which is the name of the beast or the number of its name.

Read Revelation 13:17 Using Other Translations

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.
so that no one can buy or sell unless he has the mark, that is, the name of the beast or the number of its name.
And no one could buy or sell anything without that mark, which was either the name of the beast or the number representing his name.