Revelation 14:3

3Andκαὶthey are singingᾄδουσινlikeὡςa songᾠδὴνnewκαινὴνbeforeἐνώπιονtheτοῦthroneθρόνουandκαὶbeforeἐνώπιονtheτῶνfourτεσσάρωνliving creaturesζῴωνandκαὶtheτῶνeldersπρεσβυτέρων·Andκαὶno oneοὐδεὶςwas ableἐδύνατοto learnμαθεῖνtheτὴνsongᾠδὴνifεἰnotμὴtheαἱone hundredἑκατὸνfortyτεσσεράκονταfourτέσσαρεςthousandχιλιάδες,οἱhaving been redeemedἠγορασμένοιfromἀπὸtheτῆςearthγῆς.

And they sing as 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 one hundred forty-four thousand having been bought from the earth.