'Mouth of the Lord' in the Bible

"Study and read from the book of the LORD: And not one will be missing, each will not long for its mate. For it is the mouth of the LORD that has issued the order, and it is his Spirit that has gathered them.

Then the glory of the LORD will be revealed, and all humanity will see it at once; for the mouth of the LORD has spoken."

then you will take delight in the LORD, and he will make you ride upon the heights of the earth; and he will make you feast on the inheritance of your ancestor Jacob, your father. "Yes! The mouth of the LORD has spoken."

The nations will see your vindication, and all the kings your glory; and people will call you by a new name that the mouth of the LORD will bestow.