Revelation 10:3

his voice was as loud as the roaring of a lion: and when he had cried, seven thunders uttered their voices.

Revelation 4:5

out of the throne proceeded lightnings, and thundrings, and voices: and there were seven lamps of fire burning before the throne, which are the seven spirits of God.

Revelation 8:5

and the angel took the censer, and having filled it with the fire of the altar, he cast it upon the land: and there was a noise of thunders, and lightnings, and an earthquake.

Revelation 14:2

and I heard a voice from heaven, which was like the noise of many waters, or like a great thunder-clap: I heard too a sound like that of a harp, when touch'd by the hand of a musician.

Revelation 15:1

I saw another prodigy in heaven, great and marvellous, SEVEN ANGELS, having the seven last plagues, for by them the divine vengeance is consummated.

Revelation 15:7

and one of the four animals gave to the seven angels, seven golden vials full of the wrath of God, who liveth 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
and the angel took the censer, and having filled it with the fire of the altar, he cast it upon the land: and there was a noise of thunders, and lightnings, and an earthquake.
Revelation 14:2
and I heard a voice from heaven, which was like the noise of many waters, or like a great thunder-clap: I heard too a sound like that of a harp, when touch'd by the hand of a musician.
Revelation 15:1
I saw another prodigy in heaven, great and marvellous, SEVEN ANGELS, having the seven last plagues, for by them the divine vengeance is consummated.