“And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.”
Matthew 24:31 — Greek Interlinear
Church Fathers on Matthew 24:31
Because He had spoken of mourning, which shall be only that they may bear witness against themselves and condemn themselves, that none should suppose that that mourning will end their woes, He now adds, 'And he shall send his Angels with a trump and a loud voice.'
Here we are not to think of a real trumpet, but of the voice of the archangel, which shall be so loud that at its sound all the dead shall rise out of the dust of the earth.
The sound of the trump refers to the resurrection, and the rejoicing, and to represent the astonishment which shall be then, and the woe of those that shall be left, and shall not be snatched up into the clouds.