Rev 14:1-5

And I saw, and behold, the Lamb standing on Mount Zion, and with Him one hundred and forty-four thousand, having His name and the name of His Father having been written on their foreheads. (Rev 14:1)

And I heard a voice from heaven, like the voice of many waters, and like the voice of loud thunder. And the voice which I heard was as of harpists playing on their harps. (Rev 14:2)

And they sang a new song before the throne, and before the four living creatures, and the elders; and no one was able to learn that song except the hundred and forty-four thousand who had been redeemed from the earth. (Rev 14:3)

These are those who were not defiled with women, for they are virgins. These are those who follow the Lamb wherever He goes. These were redeemed by Jesus from among men, firstfruits to God and to the Lamb. (Rev 14:4)

And no guile was found in their mouth, for they are blameless. (Rev 14:5)