Revelation 14:3 in the King James Version
And they sung as it were a new song before the throne, and before the four beasts, and the elders: and no man could learn that song but the hundred and forty and four thousand, which were redeemed from the earth.
Context
2 I heard a sound from heaven like the sound of many waters and like the sound of a great thunder. The sound which I heard was like that of harpists playing on their harps.
3 They sing a new song before the throne and before the four living creatures and the elders. No one could learn the song except the one hundred forty-four thousand, those who had been redeemed out of the earth.
4 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, the first fruits to God and to the Lamb.