Revelation 15:3-4

They were singing the song of Moses, the slave of God, and the song of the Lamb, saying. "Great and marvelous are thy works, O Lord God, the Almighty! Righteous and true are thy ways, Thou King of kings!

Revelation 19:1-6

After this I heard the semblance of the mighty voice of a great multitude in heaven, crying. "Hallelujah! Salvation and glory and power Unto the Lord our God!

Treasury of Scripture Knowledge

Summary

Thus will I magnify myself, and sanctify myself; and I will be known in the eyes of many nations, and they shall know that I am the LORD.

Bible References

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Revelation 15:3
They were singing the song of Moses, the slave of God, and the song of the Lamb, saying. "Great and marvelous are thy works, O Lord God, the Almighty! Righteous and true are thy ways, Thou King of kings!
Revelation 19:1
After this I heard the semblance of the mighty voice of a great multitude in heaven, crying. "Hallelujah! Salvation and glory and power Unto the Lord our God!