Revelation 13:15-18

Worrell(i) 15 And it was given to him to give spirit to the image of the beast, that the image of the beast should both speak, and cause that as many as worship not the image of the beast should be killed. 16 And he causes all, the small and the great, and the rich and the poor, and the free and the bond, that there be given them a mark on their right hand, or on their forehead; 17 and that no one should be able to buy or sell, except him who has the mark, the name of the beast, or the number of his name. 18 Here is wisdom. He that has understanding, let him count the number of the beast; for it is a number of a man; and his number is six hundred and sixty six.