Before entering upon the discharge of his duties, each commissioner shall take an oath, before some person authorized by law to administer it, that he will honestly, faithfully, and impartially ascertain to the best of his skill and judgment what will be a just compensation to the persons entitled thereto for the property, or interest or right therein, proposed to be taken, including, where applicable, any damages to the extent provided by section nine of this article. The oath shall be certified by the person administering it, and shall be filed, with the papers of the proceeding, in the office of the clerk of the court.
W. Va. Code § 54-2-7