“Also it forces everyone — great and small, rich and poor, free and slave — to receive a mark on his right hand or on his forehead preventing anyone from buying or selling unless he has the mark, that is, the name of the beast or the number of its name. This is where wisdom is needed; those who understand should count the number of the beast, for it is the number of a person, and its number is 666.”

Revelation 13:16 - 18 (Complete Jewish Bible)