Hisgalus 13:16-17

And it causes all, the Ketanim (small) and the Gedolim (great), both the oishir (rich) and aniyim (poor), the bnei Chorin (freedmen) and avadim (slaves), that to them should be given a tav (mark) on the yamin (right hand) and on the metsakh (forehead) of them, And that no one should be able to buy or to sell except the one having the tav (mark), the name of the Chayyah (Beast, Anti-Moshiach) or the number of its name.