Revelation 13:14 And deceiveth them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live.
15 And he had power to give life unto the image of the beast, that the image of the beast should both speak, and cause that as many as would not worship the image of the beast should be killed.
16 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:
17 And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.
18 Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six
As we close this chapter we see the false profit still deceiving the people by the power given to him by Satan and the Antichrist. He commands the people to build an image to the beast, kind of like the image Nebuchadnezzar built of himself, for people to worship. He made the image to come to life and the image spake and declared that all who would not worship the image be destroyed, sound familiar. And the profit declared that all adults and children were to receive a mark in their right hand or foreheads and if you did not have the mark then you could not buy or sell anything, including food and water. This stipulation is what is going to cause a lot of people to turn away from God for fear of losing their life, but what is worse to to stay true to God and die and be with Him in eternity or take the mark of the beast and spend eternity in hell with Satan. Also if you take the mark you are condemned and cannot come back to God. Almost everyone knows the mark and number of the beast is 666. I have to say to that you cannot accidentally get this mark you have to openly accept it saying you will worship the beast.