Revelation chapter 18 signifies the coming destruction of Jerusalem. John sees another angel or properly translated messenger, that comes down from heaven. He has great power or authority. The earth was lightened with his glory. He speaks of Babylon being fallen and is become the habitation of demons, foul spirits and a cage of unclean birds. Babylon is used to signify Jerusalem's condition. Her religious leaders had become followers of the Gentile nations gods, committing spiritual fornication because of that and making the merchants rich through her luxurious living. She had become rich physically doing business with them as she adopted their gods. The church at Laodicea was said by the Lord to be in the same condition. John hears another voice that tells God's people to come out of her. Go to the study and notes on verse 4 to see how this relates to what Jesus said to His apostles about when to leave Jerusalem. This voice tells John what is going to happen to God's city, and why. Again go to the study for a short look at national sins and how God looks at them. This messenger tells John how Jerusalem, God's city, looks at herself. She mentions not being a widow and saying she would suffer no sorrow. But that is not how God looks at her, for it is He who judges her. The messenger continues to discuss the kings and merchants who participated in her unfaithfulness to the Lord. They witness her destruction from a distance. Again, Babylon is used to signify the extent of the destruction being visited upon God's nation and temple that occurred in AD70. Go to the study to see the various Bible scriptures that provide us with this understanding. This messenger tells the heavens, apostles and prophets to rejoice over her because God has avenged what she did to them. This chapter ends with a description of the extent of the destruction involved. God's physical city, nation and temple is completely destroyed making it impossible for the Mosaic law to be practiced anymore. The last passage tells us specifically why God did this. Go to the last portion of the study to see the specific scriptural evidence for this conclusion.