Revelation 14:1-5

Then I looked, and behold—there was the young Lamb standing on Mount Zion and with him 144,000 who had his name and his Father’s name written on their foreheads. And I heard a tremendous sound coming out of heaven, like the roar of a waterfall and like the earsplitting sound of a thunderclap. The sound of music that I heard was like the sound of many harpists playing their harps. And they were singing a wonderful new song before the throne, in front of the four living creatures, and in front of the twenty-four elders. No one could learn that song except the 144,000 who had been redeemed and who have not defiled themselves with women, for they are virgins, and they join themselves to the Lamb wherever he goes. They have been purchased from humanity and brought forth as the firstfruits for God and the Lamb. Their words are always true; they are without flaw.