Revelation 13:16-18

Tree of Life Version

¹⁶ He also causes all—the small and the great, the rich and the poor, the free and the slave—to receive a mark on their right hand or upon their forehead. ¹⁷ And so no one can buy or sell unless he has the mark—either the name of the beast or the number of his name.

¹⁸ Here is wisdom: let the one who has understanding calculate the number of the beast, for it is a number of a man, and his number is 666.^[a]