Revelation 14:2-4

International Standard Version

² Then I heard a sound from heaven like that of many waters and like the sound of loud thunder. The sound I heard was like harpists playing on their harps. ³ They were singing a new song in front of the throne, the four living creatures, and the elders. No one could learn the song except the 144,000 who had been redeemed from the earth. ⁴ They have not defiled themselves with women, for they are virgins, and they follow the lamb wherever he goes. They have been redeemed from among humanity as the first fruits for God and the lamb.