Revelation 14:3-7

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 the song except the 144,000 who had been purchased from the earth.

These are the ones who have not defiled themselves with women, for they are celibate. These are the ones who follow the Lamb wherever He goes. These have been purchased from mankind as first fruits to God and to the Lamb.

And no lie was found in their mouths; they are blameless. Vision of the Angel with the Gospel

And I saw another angel flying in midheaven with an eternal gospel to preach to those who live on the earth, and to every nation, tribe, language, and people;

and he said with a loud voice, “Fear God and give Him glory, because the hour of His judgment has come; worship Him who made the heaven and the earth, and sea and springs of waters.”