'Mouth of the Lord' in the Bible

He humbled you and let you be hungry, and fed you with manna which you did not know, nor did your fathers know, that He might make you understand that man does not live by bread alone, but man lives by everything that proceeds out of the mouth of the Lord.

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

Then the glory of the Lord will be revealed,And all flesh will see it together;For the mouth of the Lord has spoken.”

Then you will take delight in the Lord,And I will make you ride on the heights of the earth;And I will feed you with the heritage of Jacob your father,For the mouth of the Lord has spoken.”

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

Who is the wise man that may understand this? And who is he to whom the mouth of the Lord has spoken, that he may declare it? Why is the land ruined, laid waste like a desert, so that no one passes through?

Thus says the Lord of hosts,“Do not listen to the words of the prophets who are prophesying to you.They are leading you into futility;They speak a vision of their own imagination,Not from the mouth of the Lord.

Each of them will sit under his vineAnd under his fig tree,With no one to make them afraid,For the mouth of the Lord of hosts has spoken.