Revelation 10:6-7
10:6 and swore by the one who lives forever and ever, who created heaven and what is in it, and the earth and what is in it, and the sea and what is in it, “There will be no more delay!
10:7 But in the days when the seventh angel is about to blow his trumpet, the mystery of God is completed, just as he has proclaimed to his servants the prophets.”