John Calvin on Isaiah 22:19

19. And I will cast thee out. He says nothing new, but concludes the former prediction. Though in the next verse he will again mention Shebna, yet now he gives a brief summary of what has been already said. Shebna thought that he had a fixed abode in Jerusalem, so that, whatever might happen, he thought that he could not be driven or removed from it. But the Lord threatens that he will cast him out, and will banish him to a distant country. Thus, the Lord frequently overturns the thoughts of the wicked, (Psalm 33:10,) who, relying on their cunning and dexterity, toss about public affairs according to their own pleasure. The change of person shews that the Prophet speaks sometimes in his own name, and sometimes in the name of God.