Joel 2:11

And the Lord shall utter His voice -The prophet had described at length the coming of God’s judgments, as a mighty army. But lest amid the judgments, people should, (as they often do) forget the Judge, he represents God, as commanding this His army, gathering, ordering, marshalling, directing them, giving them the word, when and upon whom they should pour themselves. Their presence was a token of His. They should neither anticipate that command, nor linger. But as an army awaits the command to move, and then, the word being given, rolls on instantly, so God’s judgments await the precise moment of His Will, and then fall.