REV 14:3

3 And they sing, as it were, a Shir Chadash [(New Song)] before the Kes [(Throne)] and before the Arbah Chayyot [(four living beings)] and before the Zekenim[(Elders)], and no one was being able to learn the Shir [(Song)] except the 144,000, the ones for whom the Geulah price had been paid for their redemption, the ones having been redeemed [(purchased)] from haaretz [(the earth)].