Revelation 1:15

when glowing in a furnace; and his voice as the sound of many waters.

Revelation 19:6

and I heard as it were the voice of a great multitude, which was like the sound of many waters, or like a volley of thunder, saying, "alleluia: for the Lord God omnipotent does reign."

Treasury of Scripture Knowledge

Summary

And when they went, I heard the noise of their wings, like the noise of great waters, as the voice of the Almighty, the voice of speech, as the noise of an host: when they stood, they let down their wings.

Bible References

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Revelation 1:15
when glowing in a furnace; and his voice as the sound of many waters.
Revelation 19:6
and I heard as it were the voice of a great multitude, which was like the sound of many waters, or like a volley of thunder, saying, "alleluia: for the Lord God omnipotent does reign."