Revelation 1:4

John to the seven churches in Asia: spiritual blessing and peace to you from Him who is and was and is to come, and from the seven spirits that are before His throne,

Revelation 1:20

The open secret of the seven stars that you have seen in my right hand, and of the seven golden lampstands, is this: The seven stars are the messengers of the seven churches, and the seven lampstands are the seven churches.

Revelation 5:1

Then I saw in the right hand of Him who was seated on the throne a book with writing on both sides, sealed with seven seals.

Revelation 5:6

Then I saw, midway between the throne and the four living creatures, standing among the elders, a Lamb that looked as though He had been slaughtered. He had seven horns and seven eyes; the latter are the seven spirits of God which are sent on duty to every portion of the earth.

Revelation 8:2

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

Revelation 8:6

And the seven angels with the seven trumpets prepared to blow them.

Revelation 10:3

and in a loud voice he shouted like the roaring of a lion; and when he had shouted, the seven thunders rumbled.

Revelation 15:1

Then I saw another symbol in heaven, great and wonderful: seven angels bringing seven plagues which are to be the last, because with them God's wrath is completely expressed.

Revelation 15:7

Then one of the four living creatures gave the seven angels seven bowls of gold, full of the wrath of God who lives forever and ever,

Revelation 16:1

Then I heard a loud voice from the sanctuary say to the seven angels: "Go and empty the seven bowls of God's wrath 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 in Asia: spiritual blessing and peace to you from Him who is and was and is to come, and from the seven spirits that are before His throne,
Revelation 5:1
Then I saw in the right hand of Him who was seated on the throne a book with writing on both sides, sealed with seven seals.
Revelation 8:2
Then I saw the seven angels who stand before God, and seven trumpets were given to them.
Revelation 10:3
and in a loud voice he shouted like the roaring of a lion; and when he had shouted, the seven thunders rumbled.
Revelation 15:1
Then I saw another symbol in heaven, great and wonderful: seven angels bringing seven plagues which are to be the last, because with them God's wrath is completely expressed.
Revelation 16:1
Then I heard a loud voice from the sanctuary say to the seven angels: "Go and empty the seven bowls of God's wrath upon the earth."