Non-Christian and non-Bible person here, but I think it’s probably best to be accurate about citing these things:

Revelation 13:16-17 King James Version

16 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:

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.

Source: https://www.biblegateway.com/passage/?search=Revelation+13%3A16-17&version=KJV which also lets you switch around between other versions of the passage.