Revelation 14:1-4

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. And they sang a new song before the throne [of God] and before the four living creatures and the elders; and no one could learn the song except the hundred and forty-four thousand who had been purchased (ransomed, redeemed) from the earth. [Rev 7:4-8] These are the ones who have not been defiled [by relations] with women, for they are celibate. These are the ones who follow the Lamb wherever He goes. These have been purchased and redeemed from among men [of Israel] as the first fruits [sanctified and set apart for special service] for God and the Lamb. [Mark 8:34]