Revelation 14:3

14:3 and they were singing a new song before the throne and before the four living creatures and the elders. No one was able to learn the song except the one hundred and forty-four thousand who had been redeemed from the earth.

Revelation 14:6

Three Angels and Three Messages

14:6 Then I saw another angel flying directly overhead, and he had an eternal gospel to proclaim to those who live on the earth – to every nation, tribe, language, and people.