Revelation 1:20-1
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 7:1
And, after these things, I saw four angels, standing at the four corners of the earth, holding the four winds of the earth, that the wind might not blow upon the earth, nor upon the sea, nor on any tree.
Revelation 8:2
And I saw the seven angels which stood before God; and seven trumpets were given to them.
Revelation 11:15
And the seventh angel sounded, and there were great voices in heaven, saying, The kingdoms of the world are become the kingdoms of our Lord, and of his Christ; and he shall reign for ever and ever.
Revelation 14:6-9
And I saw another angel flying through the midst of heaven, having everlasting good news to proclaim to the inhabitants of the earth, even to every nation, and tribe, and tongue, and people;