'Mouth of the Lord' in the Bible

He humbled you and allowed you to be hungry and fed you with manna, [a substance] which you did not know, nor did your fathers know, so that He might make you understand [by personal experience] that man does not live by bread alone, but man lives by every word that proceeds out of the mouth of the Lord.

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.

Who is the wise man who may understand this [without any doubt]? To whom has the mouth of the Lord spoken, so that he may declare it? Why is the land ruined, laid waste like a wilderness, so that no one passes through?

Thus says the Lord of hosts,“Do not listen to the words of the [false] prophets who prophesy to you.They are teaching you worthless things and are leading you into futility;They speak a vision of their own mind and imaginationAnd not [truth] from the mouth of the Lord.

Each of them shall sit [in security and peace] under his vineAnd under his fig tree,With no one to make them afraid,For the mouth of the [omnipotent] Lord of hosts has spoken it.