The piling up of these expressions serves to highlight the achievements of heaven’s victory over the dragon and his angels. The first three terms—salvation, power, kingdom—are all of God.
The term “salvation…of God” indicates the deliverance God has granted from the dragon’s dominance. The term power…of God
describes the heavenly strength God revealed in accomplishing this salvation. The term “kingdom of God” indicates what heaven now is, with no resistance of any form in heaven ever again. The final phrase, “the authority of his Christ” (God’s anointed one; see Psalm 2:2), announces the wonderful cause of the dragon’s humiliation; it’s all because God has anointed his Son, and the Son has begun to reign.
10 And I heard a loud voice in heaven, saying, “Now the salvation and the power and the kingdom of our God and the authority of his Christ have come, for the accuser of our brothers has been thrown down, who accuses them day and night before our God.