Revelation 15:2,3

"And. saw as it were. sea of glass mingled with fire; and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God. And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvelous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints."--15:2-3.

The scene opens in heaven. The apostle beholds. multitude of joyous ones having the harps or God, and singing the song of Moses and the Lamb. We are left, in no doubt concerning the identity of these singers. They are "them in who had gotten the victory over the beast and his image, and over his mark and the number of his name." The ground of their rejoicing is also recorded. "All nations shall come and worship before thee; for thy judgments are made manifest. " The mighty arm of God is to be revealed in bringing to naught the powers of evil, and especially all the great enemies over whom they had been victorious. The saints who have undergone the persecution of the beast are represented as rejoicing because the day of its judgment has come.