Revelation 13:17
so that no one could buy or sell unless he had the mark — the name of the beast or the number of its name.
What it says
No one can buy or sell without the mark, the beast's name, or the number of its name.
What it is doing
This verse shows economic participation tied to worshipful compliance.
In context
16And 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, 17so that no one could buy or sell unless he had the mark — the name of the beast or the number of its name. 18Here 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.