'Mouth of the Lord' in the Bible

But if you refuse and rebel,You shall be devoured by the sword.”For the mouth of the Lord has spoken.

“And the glory and majesty and splendor of the Lord will be revealed,And all humanity shall see it together;For the mouth of the Lord has spoken it.”

Then you will take pleasure in the Lord,And I will make you ride on the high places of the earth,And I will feed you with the [promised] heritage of Jacob your father;For the mouth of the Lord has spoken.”

The nations will see your righteousness and vindication [by God],And all kings [will see] your glory;And you will be called by a new nameWhich the mouth of the Lord will designate.