Revelation 1:4

John to the seven churches in Asia, blessing and peace to you from him who is and was and is coming, and from the seven spirits before his throne,

Revelation 1:20

The secret meaning of the seven stars that you saw in my right hand, and of the seven gold lampstands is this: The seven stars are the guardian angels of the seven churches and the seven lampstands are the seven churches.

Revelation 5:1

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

Revelation 5:6

Then I saw standing in the center of the throne and of the four animals and of the elders a Lamb which seemed to have been slaughtered. He had seven horns and seven eyes; these are the seven spirits of God, which are sent on errands to all parts of the earth.

Revelation 8:2

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

Revelation 8:6

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

Revelation 10:3

and he uttered a great shout like the roar of a lion; and when he shouted, the seven thunders raised their voices.

Revelation 15:1

Then I saw another great, marvelous portent in heaven. There were seven angels with seven plagues which are to be the last, for they complete the expression of God's wrath.

Revelation 15:7

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

Revelation 16:1

Then I heard a loud voice from the temple 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, blessing and peace to you from him who is and was and is coming, and from the seven spirits before his throne,
Revelation 5:1
Then I saw lying in the right hand of him who was seated on the throne a roll with writing on both sides, sealed with seven seals.
Revelation 8:2
Then I saw the seven angels who stood before God, and seven trumpets were given to them.
Revelation 10:3
and he uttered a great shout like the roar of a lion; and when he shouted, the seven thunders raised their voices.
Revelation 15:1
Then I saw another great, marvelous portent in heaven. There were seven angels with seven plagues which are to be the last, for they complete the expression of God's wrath.
Revelation 16:1
Then I heard a loud voice from the temple say to the seven angels, "Go and empty the seven bowls of God's wrath upon the earth!"