Revelation 12:9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceives the whole world: he was cast out into the earth, and his angels were cast out with him.
The two phrases: “Cast out” and “Cast out into the earth” represent two different casting out. When he was first cast out, the earth was not in existence and that’s the reason why the first phrase stops at cast out. The second casting out refers to that time at the cross, when he was forever banished from going even near the gates of heaven. Up until the Cross, satan and his angels could reach as far as the gates of heaven.
This is why the scripture tells us that he showed up when the sons of God, the representatives of the other unfallen worlds, were called to a summit. At that time satan showed up as the representative of earth, because he had succeeded in taking over the dominion from Adam, through transgression. Job 1: 6 Now there was a day when the sons of God came to present themselves before the Lord, and Satan came also among them.
[Early Writings pp 39] There is perfect order and harmony in the Holy City. All the angels that are commissioned to visit the earth hold a golden card, which they present to the angels at the gates of the city as they pass in and out…. But after the Cross, satan and all his minions were barred forever from the gates of heaven, and they were restricted to this earth alone. These truths should be understood clearly by all, so as not to be confused by all the noise out there.
Revelation 12: 10 And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God, day and night.
May The Lord add His blessing to the study of His word. God bless!