16. And he causes all, both small and great, and rich and poor, and free and slave, to be given a mark upon their right hand or upon their foreheads,
17. and that no one should be able to buy or sell except he that has the mark or the name of the beast, or the number of his name.
18. Here is the wisdom! He who has understanding, let him calculate the number of the beast, for it is the number of a man, and his number is 666.