Nehemiah 6:9 - Ellicott's Commentary On The Whole Bible

Now therefore, O God, strengthen my hands. — The answer sent was that the thing was not true, and that the report itself did not exist. The reflection in Nehemiah’s journal was that they sought to make him afraid. Quoting this, he adds the prayer that he recorded when he wrote it. It is one of those sudden, interjectional petitions which abound in the narrative, and is all the more remarkable from the absence of the words “O God,” which are here inserted.