Every director, when elected or appointed, shall take an oath that the director shall, so far as the duty devolves upon a director, diligently and honestly administer the affairs of the association and will not knowingly violate or willingly permit to be violated any of the provisions of this title. Such oath, subscribed by the director making it and certified by the officer before whom it was taken, at once must be transmitted to the commissioner to be filed in the commissioner’s office.