Revelation 1:4

John, to the seven congregation which are in Asia; favor and peace be with you, from him who is, and who was, and who is to come; and from the seven spirits which are before his throne;

Revelation 1:20

As to the hidden meaning of the seven stars, which you see in my right hand, and of the seven lamps of gold: the seven stars are messengers of the seven congregations; and the seven lamps which you see, are seven congregations.

Revelation 5:1

And I saw in the right hand of him who sat on the throne, a scroll written within and without, sealed with seven seals.

Revelation 5:6

And I beheld, in the middle space, between the throne and the four living creatures, and in the midst of the elders, there stood a Lamb, which seemed to have been slain, having seven horns, and seven eyes; these are the seven Spirits of God, sent forth into all the earth.

Revelation 8:2

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

Revelation 8:6

And the seven angels who had the seven trumpets, prepared themselves to sound.

Revelation 10:3

And he cried out with a loud voice, as when a lion roars: and when he cried, the seven thunders uttered their voices.

Revelation 15:1

And I saw another great and wonderful sign in heaven; seven angels, who had the seven last plagues; because in them the wrath of God was to be completed.

Revelation 15:7

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

Revelation 16:1

And I heard a great voice out of the temple saying, to the seven angels, Go, and pour out the vials 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 congregation which are in Asia; favor and peace be with you, from him who is, and who was, and who is to come; and from the seven spirits which are before his throne;
Revelation 5:1
And I saw in the right hand of him who sat on the throne, a scroll written within and without, sealed with seven seals.
Revelation 8:2
And I saw the seven angels which stood before God; and seven trumpets were given to them.
Revelation 10:3
And he cried out with a loud voice, as when a lion roars: and when he cried, the seven thunders uttered their voices.
Revelation 15:1
And I saw another great and wonderful sign in heaven; seven angels, who had the seven last plagues; because in them the wrath of God was to be completed.
Revelation 16:1
And I heard a great voice out of the temple saying, to the seven angels, Go, and pour out the vials of the wrath of God upon the earth.