Revelation 13:11-18 New American Bible (Revised Edition) (NABRE)
11 Then I saw another beast come up out of the earth; it had two horns like a lamb’s but spoke like a dragon. 12 It wielded all the authority of the first beast in its sight and made the earth and its inhabitants worship the first beast, whose mortal wound had been healed. 13 It performed great signs, even making fire come down from heaven to earth in the sight of everyone. 14 It deceived the inhabitants of the earth with the signs it was allowed to perform in the sight of the first beast, telling them to make an image for the beast who had been wounded by the sword and revived. 15 It was then permitted to breathe life into the beast’s image, so that the beast’s image could speak and [could] have anyone who did not worship it put to death. 16 It forced all the people, small and great, rich and poor, free and slave, to be given a stamped image on their right hands or their foreheads, 17 so that no one could buy or sell except one who had the stamped image of the beast’s name or the number that stood for its name.
18 [a]Wisdom is needed here; one who understands can calculate the number of the beast, for it is a number that stands for a person. His number is six hundred and sixty-six.