Revelation 4:8
And the four living creatures had, each of them, six wings round about; and within they were full of eyes: and they rest not, day or night, saying, Holy, holy, holy, Lord God Almighty, who wast, and art, and art to come.
Revelation 7:11
And all the messengers stood round about the throne, and about the elders, and the four living creatures; and they fell down on their faces, before the throne, and worshiped God;
Revelation 8:13
And I beheld, and heard one of the angels flying in the midst of heaven, saying with a loud voice, Woe, woe, woe, to those who dwell upon the earth, for the remaining sounds of the trumpets of the three angels, which are yet to sound!
Revelation 14:6
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;