Oecumenius — on Rev 11:15 (Commentary on Revelation)

“As a detour, the vision recounts the matters concerning the two witnesses, who are identified as prophets, and elaborates on all that pertains to them, focusing on their origin and where they have come from. They have come forth from the holy restitution of the future, and that the number of those from the nations surpasses that of Israel, and that those who have pleased God in the New Covenant exceed those in the Old. And it states that when the seventh angel sounded his trumpet, voices were heard in heaven proclaiming that the kingdom of the world has become the kingdom of God and of His Christ. God always reigns, and He neither began nor will cease to reign over heaven and earth and all things visible and invisible within them, but He is the Ruler and Lord of all things without beginning and without end. Since men also became kings on earth, God had a certain way of sharing kingship with them; but when the earthly kingdom of men is dissolved at the end of the present age, only God will reign. Therefore, it has been said that the kingdom of the world has become the kingdom of God and of His Christ, with the men who ruled on earth and the tyrannical demons having been destroyed and ceased.”