Revelation 8:13
And I beheld, and heard an angel flying in the midst of heaven saying with a loud voice, Wo, wo, wo to the inhabitants on the earth from the other voices of the trumpet of the three angels, that are yet to sound.
Revelation 11:14
The second wo is past, and behold the third wo is coming quickly.
Revelation 9:12
Thus one wo is past, but behold two woes more are coming after.
Revelation 14:6
And I saw another angel flying in the midst of heaven, having the everlasting gospel, to preach to those that dwell upon the earth, to every nation, and tribe, and tongue,
Revelation 19:17
And I saw an angel standing in the sun; and he cried with a loud voice, saying to all the fowls that fly in the midst of heaven, Come and gather yourselves together to the banquet of the great God;
Hebrews 1:14
Are they not all ministring spirits, sent forth to attend on those who shall be heirs of salvation?
Revelation 9:1
And the fifth angel sounded his trumpet, and I saw a star fall from heaven to the earth: and the key of the bottomless pit was given to him.
Revelation 14:3
and they sung as it were a new song before the throne; and before the four living ones, and the elders: and none could learn the song, but the hundred and forty four thousand, who are redeemed from the earth.