Revelation 1:4

John to the seven churches which are in Asia: Grace be with you, and peace from him, who is, and who was, and who is coming; and from the seven spirits which are before the throne of God,

Revelation 1:20

the mystery of the seven stars which thou seest in my right hand, and the seven golden lamps. The seven stars are the angels of the seven churches, and the seven lamps which thou seest are the seven churches.

Revelation 5:1

AND I saw on the right hand of him who was seated on the throne a [volume of a] book written within, and on the back sealed with seven seals.

Revelation 5:6

And I beheld, and lo! in the midst of the throne, and of the four living beings, and in the midst of the presbyters, stood a lamb as just slaughtered, having seven horns and seven eyes, which are the seven spirits of God that are sent forth into all the world:

Revelation 8:2

And I saw the seven angels which stood before God, and there were given to them seven trumpets.

Revelation 8:6

And the seven angels holding the seven trumpets prepared themselves to sound.

Revelation 10:3

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

Revelation 15:1

AND I saw another sign in the heaven, great and wonderful, seven angels having the seven last plagues because by them is the wrath of God completely executed.

Revelation 15:7

And one of the four living beings gave unto the seven angels seven golden vases full of the wrath of God, who liveth for ever and ever.

Revelation 16:1

AND I heard a loud voice out of the temple, saying to the seven angels, Go and pour out the vases of the wrath of God upon the earth.

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 be with you, and peace from him, who is, and who was, and who is coming; and from the seven spirits which are before the throne of God,
Revelation 5:1
AND I saw on the right hand of him who was seated on the throne a [volume of a] book written within, and on the back sealed with seven seals.
Revelation 8:2
And I saw the seven angels which stood before God, and there were given to them seven trumpets.
Revelation 10:3
and cried with a loud voice, as a lion roareth: and when he had cried, the seven thunders uttered their voices.
Revelation 15:1
AND I saw another sign in the heaven, great and wonderful, seven angels having the seven last plagues because by them is the wrath of God completely executed.
Revelation 16:1
AND I heard a loud voice out of the temple, saying to the seven angels, Go and pour out the vases of the wrath of God upon the earth.