Revelation 14:1-5

And I looked, and behold, the Lamb standing on Mount Zion, and with him one hundred forty-four thousand who had his name and the name of his Father written on their foreheads. And I heard a sound from heaven like the sound of many waters and like the sound of loud thunder, and the sound that I heard was like harpists playing on their harps. And they were singing something like a new song before the throne and before the four living creatures and the elders, and no one was able to learn the song except the one hundred forty-four thousand who had been bought from the earth. These are those who have not been defiled with women, for they are virgins. These are the ones who follow the Lamb wherever he goes. These were bought from humanity as first fruits to God and to the Lamb, and in their mouth a lie was not found; they are blameless.