Mark of the Beast (let's talk about it)

Revelation 13:16-17
And he causes 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, and he provides that no one will be able to buy or to sell, except the one who has the mark, either the name of the beast or the number of his name.

Revelation 14:9-10
Then another angel, a third one, followed them, saying with a loud voice, “If anyone worships the beast and his image, and receives a mark on his forehead or on his hand, he also will drink of the wine of the wrath of God, which is mixed in full strength in the cup of His anger; and he will be tormented with fire and brimstone in the presence of the holy angels and in the presence of the Lamb.

Revelation 7:2
And I saw another angel ascending from the rising of the sun, having the seal of the living God; and he cried out with a loud voice to the four angels to whom it was granted to harm the earth and the sea,

Revelation 13:16
And he causes 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,

Revelation 13:17
and he provides that no one will be able to buy or to sell, except the one who has the mark, either the name of the beast or the number of his name.

Source: https://bible.knowing-jesus.com/topics/Mark-Of-The-Beast