Revelation 14:2-5

2And I heard a sound from heaven like the roar of many waters and the loud rumbling of thunder. And the sound I heard was like harpists strumming their harps.

3And they sang a new song before the throne and before the four living creatures and the elders. And no one could learn the song except the 144,000 who had been redeemed from the earth. 4These are the ones who have not been defiled with women, for they are virgins. They follow the Lamb wherever He goes. They have been redeemed from among men as firstfruits to God and to the Lamb. 5And no lie was found in their mouths; they are blameless.1