Revelation 10:3

and he cried out with a loud voice, like the roar of a lion. When he shouted, the voices of the seven thunders spoke.

Revelation 4:5

From the throne come flashes of lightning, and voices and peals of thunder. And before the throne were seven lamps of fire, which are the seven spirits of God;

Revelation 8:5

Then the angel took the censer and filled it with fire from the altar and threw it on the earth; and there were peals of thunder, voices, flashes of lightning, and an earthquake.

Revelation 14:2

I heard a voice from heaven like the sound of many waters and like the sound of loud thunder, and the voice I heard was like the sound of harpists playing on their harps.

Revelation 15:1

Then I saw another sign in heaven, great and marvelous, seven angels with seven plagues, which are the last, because with them the wrath of God is finished.

Revelation 15:7

Then one of the four living creatures gave to the seven angels seven golden bowls full of the wrath of God, who lives for ever and ever.

Treasury of Scripture Knowledge

Summary

And cried with a loud voice, as when a lion roareth: and when he had cried, seven thunders uttered their voices.

Bible References

Seven

Revelation 8:5
Then the angel took the censer and filled it with fire from the altar and threw it on the earth; and there were peals of thunder, voices, flashes of lightning, and an earthquake.
Revelation 14:2
I heard a voice from heaven like the sound of many waters and like the sound of loud thunder, and the voice I heard was like the sound of harpists playing on their harps.
Revelation 15:1
Then I saw another sign in heaven, great and marvelous, seven angels with seven plagues, which are the last, because with them the wrath of God is finished.