15 The seventh angel sounded, and there followed great voices in heaven, saying, “The kingdom of the world has become the kingdom of our Lord, and of his Christ. He will reign forever and ever!”
the seventh angel sounded – “the last trumpet” see 1 Cor 15:52.
there were loud voices in heaven – shouts of joy from those who had resurrected.
the kingdom of this world has become the kingdom of our LORD and His Christ – here John calls God “the LORD” again, for we have returned to the LORD’s Day, and Jesus Christ is no longer our Lord. See also Dan 7:14, Dan 7:27; 1 Cor 15:23-28.