Revelation 13:11, 14, 16-17

Then I saw another beast rising up out of the earth; he had two horns like a lamb and he spoke like a dragon. [Matt 7:15, 16]

And he deceives those [unconverted ones] who inhabit the earth [into believing him] because of the signs which he is given [by Satan] to perform in the presence of the [first] beast, telling those who inhabit the earth to make an image to the beast who was wounded [fatally] by the sword and has come back to life. [Deut 13:1-5; Mark 13:22; 2 Thess 2:9, 10]

Also he compels all, the small and the great, and the rich and the poor, and the free men and the slaves, to be given a mark on their right hand or on their forehead [signifying allegiance to the beast], and that no one will be able to buy or sell, except the one who has the mark, either the name of the beast or the number of his name.