Revelation 15:2-3

2I also saw something like a sea of glass mixed with fire, and those who had won the victory over the beast, its image, and the number of its name, were standing on the sea of glass with harps from God.

3They sang the song of God’s servant Moses and the song of the Lamb: Great and awe-inspiring are your works, Lord God, the Almighty; just and true are your ways, King of the nations.