Revelation 14:1-2

Then I looked, and this is what I saw: the Lamb stood [firmly established] on Mount Zion, and with Him a hundred and forty-four thousand who had His name and His Father’s name inscribed on their foreheads [signifying God’s own possession]. [Joel 2:32] And I heard a voice from heaven, like the sound of great waters and like the rumbling of mighty thunder; and the voice that I heard [seemed like music and] was like the sound of harpists playing on their harps.