Revelation 14:1-2

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.