Are you a Jewish male virgin? I'm not so I cannot receive such seal. And they are harmed, every one of them in short order. That's why they are in heaven by Rev 15:1-5.
Rev 14:1 Then I looked, and behold, a Lamb standing on Mount Zion, and with Him one hundred and forty-four thousand, having His Father’s name written on their foreheads.Rev 14:2 And I heard a voice from heaven, like the voice of many waters, and like the voice of loud thunder. And I heard the sound of harpists playing their harps.
Rev 14:3 They sang as it were a new song before the throne, before the four living creatures, and the elders; and no one could learn that song except the hundred and forty-four thousand who were redeemed from the earth.
Rev 14:4 These are the ones who were not defiled with women, for they are virgins. These are the ones who follow the Lamb wherever He goes. These were redeemed from among men, being firstfruits to God and to the Lamb.
Rev 14:5 And in their mouth was found no deceit, for they are without fault before the throne of God.