Revelation 1:4

John, to the seven churches which are in Asia: grace to you and peace from him who is and who was and who is to come, and from the seven spirits who are before his throne,

Revelation 1:20

The mystery of the seven stars which you saw in my right hand, and the seven golden lampstands: the seven stars are the angels of the seven churches, and the seven lampstands are the seven churches.

Revelation 5:1

I saw in the right hand of him who sat on the throne a scroll written inside and on the back, sealed with seven seals.

Revelation 5:6

And between the throne and the four living creatures and among the elders, I saw a Lamb standing, as if it had been slain, with seven horns and with seven eyes, which are the seven spirits of God sent out into all the earth.

Revelation 8:2

And I saw the seven angels who stand before God, and to them were given seven trumpets.

Revelation 8:6

The seven angels who had the seven trumpets prepared to sound them.

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 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.

Revelation 16:1

Then I heard a loud voice from the temple, saying to the seven angels, "Go and pour out on the earth the seven bowls of the wrath of God."

Treasury of Scripture Knowledge

Summary

And seven priests shall bear before the ark seven trumpets of rams' horns: and the seventh day ye shall compass the city seven times, and the priests shall blow with the trumpets.

Bible References

Seven times

Revelation 1:4
John, to the seven churches which are in Asia: grace to you and peace from him who is and who was and who is to come, and from the seven spirits who are before his throne,
Revelation 5:1
I saw in the right hand of him who sat on the throne a scroll written inside and on the back, sealed with seven seals.
Revelation 8:2
And I saw the seven angels who stand before God, and to them were given seven trumpets.
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 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 16:1
Then I heard a loud voice from the temple, saying to the seven angels, "Go and pour out on the earth the seven bowls of the wrath of God."