The speaker, or speakers, is not identified but the voice comes from heaven with an awesome sound like a large body of flowing waters and great thunder. It also had a sweet melody like harpers playing their harps. The word "they" here apparently refers to those who make up the voice in heaven. They are singing a new song which cannot be learned by men, save for the 144,000 redeemed. Perhaps the song is of redemption and its joys and benefits which could only be known by the redeemed.

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