Revelation 13:15-17 = "...It foced 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, 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."Folks, there's no doubt, that's the "mark of the beast" being talked about there. The only issue is, "how/what" exactly is this mark of the beast on the forehead and hand.
"Then I looked and there was the Lamb standing on Mount Zion, and with him a hundred and forty-four thousand who had His Name and His Father's Name written on their foreheads...These are they who were not defiled with women; they are virgins and these are the one who follow the Lamb wherever He goes...On their lips no deceit has been found; they are unblemished."Folks, notices how "His (Lamb) Name and His Father's Name" is mentioned to be marked on their _foreheads_?