Revelation 14:3-4 NIV

3 And they sang a new song1 before the throne and before the four living creatures2 and the elders.3 No one could learn the song except the 144,0004 who had been redeemed from the earth.

References for Revelation 14:3

      4 These are those who did not defile themselves with women, for they kept themselves pure.5 They follow the Lamb wherever he goes.6 They were purchased from among men7 and offered as firstfruits8 to God and the Lamb.

      References for Revelation 14:4