Revelation 7:4 And I heard the number of those sealed, (144 thousands were sealed out of all the tribes of the sons of Israel): (See RSV)

Revelation 14:1 Then I looked, and I saw the Lamb standing upon Mount Zion, and with Him 144,000 people, having His name and His Father's name written on their foreheads. (See RSV)

Revelation 14:3 And they were singing what seemed to be a new song, in front of the throne and in the presence of the four living creatures and the Elders; and no one was able to learn that song except the 144,000 people who had been redeemed out of the world. (See RSV)