Revelation 12:10: And I heard a loud voice saying in heaven . . . the accuser of our brethren is cast down, which accused them before our God day and night.

In Revelation 12:10, the loud voice in heaven came from righteous spirits in heaven that kept their first estate.¹ They rejoiced when Satan (the Dragon) was cast down at the end of the war in heaven.²

Throughout the war in heaven, the Dragon was known as the accuser, which means Satan.³ Anciently, an accuser was someone who formally complained against another in a legal setting.⁴ In scripture, an accuser is any enemy or adversary,⁵ including a betrayer and slanderer⁶ that speaks falsely against another.⁷ In the premortal existence, Lucifer was an accuser in every sense of the word.⁸ His faith-destroying accusations in the first estate⁹ mirror his continuing accusations on earth.¹⁰

Satan made his accusations against his brethren.¹¹ This refers to Michael and other premortal spirits loyal to Jehovah.¹² Satan made his accusations to God the Father as the only judge who could consider such premortal accusations.¹³ The Father allowed the accusations to be made¹⁴ so that the necessary opposition in all things would be present in the first estate.¹⁵ Since Satan was the accuser of our brethren, Michael is the advocate in favor of the brethren according to Rabbinic tradition.¹⁶

Satan made his accusations both day and night without ceasing (continuously) throughout the war in heaven¹⁷ until he and his unembodied host were cast down from heaven when the war in heaven ended.¹⁸