“Then I saw another angel flying in the midst of heaven, having the everlasting gospel to preach to those who dwell on the earth – to every nation, tribe, tongue, and people – saying with a loud voice, ‘Fear God and give glory to Him, for the hour of His judgment has come; and worship Him who made heaven and earth, the sea and springs of water.’” Revelation 14:6-7.
“Then the fifth angel sounded: And I saw a star fallen from heaven to the earth. And to him was given the key to the bottomless pit. And he opened the bottomless pit, and smoke arose out of the pit like the smoke of a great furnace. And the sun and the air were darkened because of the smoke of the pit.” Revelation 9:1-2.
“And to the angel of the church in Philadelphia write, ‘These things says He who is holy, He who is true, He who has the key of David, He who opens and no one shuts, and shuts and no one opens’” Revelation 3:7.
“And to the angel of the church in Sardis write, ‘These things says He who has the seven Spirits of God and the seven stars: ‘I know your works, that you have a name that you are alive, but you are dead. Be watchful, and strengthen the things which remain, that are ready to die, for I have not found your works perfect [finished or complete] before God. Remember therefore how you have received and heard; hold fast and repent. Therefore if you will not watch, I will come upon you as a thief, and you will not know what hour I will come upon you.’” Revelation 3:1-3.
“And to the angel of the church in Thyatira write, ‘These things says the Son of God, who has eyes like a flame of fire, and His feet like fine brass…’”, Revelation 2:18.