As was clear from Job 1:9–12, Job 2:4–6, and Zechariah 3:1, Satan habitually accused God’s Old Testament people, in God’s presence, of the sins he had enticed them to commit. In fact, the loud voice in heaven adds at the end of this verse that Satan made his accusations “day and night before our God.” Though Scripture offers us little information on this matter, this text alone makes clear that throughout the centuries of Old Testament history, Satan was habitually in heaven to accuse God’s people. Given the sinfulness of the saints, it is self-evident that Satan’s accusations would be accurate (note Joshua’s dirty clothes in Zechariah 3:3). But that is now finished; “the accuser of our [Old Testament] brothers has been thrown down!”
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.