16 Also it causes all, both small and great, both rich and poor, both free and slave,^{1 q}to be marked on the right hand or the forehead, 17 so that no one can buy or sell unless he has the mark, that is, ^rthe name of the beast or ^sthe number of its name. 18 ^tThis calls for wisdom: let the one who has understanding calculate the number of the beast, for it is the number ^uof a man, and his number is 666.²