Rev 10:7 7 but that in the days of the trumpet call to be sounded by the seventh angel, the mystery of God, as he announced to his servants the prophets, should be fulfilled.
Do you know the mystery??
The mystery was revealed by His prophet Paul in 1 Corrinthians..
(1 Corinthians 15:51-55) "Behold,
I shew you a mystery; We shall not all sleep, but we shall all be changed, {52} In a moment, in the twinkling of an eye,
at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. {53} For this corruptible must put on incorruption, and this mortal must put on immortality. {54} So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory. {55} O death, where is thy sting? O grave, where is thy victory?"