Every person before entering upon the discharge of any function as an officer of this Commonwealth shall take and subscribe the following oath: “I do solemnly swear (or affirm) that I will support the Constitution of the United States, and the Constitution of the Commonwealth of Virginia, and that I will faithfully and impartially discharge all the duties incumbent upon me as ____________________ according to the best of my ability, (so help me God).” Any person reappointed to any office filled by gubernatorial appointment for a subsequent term to begin immediately upon expiration of an existing term shall not be required to renew the oath set out in this section; however, the original oath taken shall continue in effect with respect to the subsequent term. Const., § 34; Code 1919, § 269; 1936, p. 49; 1971, Ex. Sess., c. 16; 1980, c. 320; 1988, c. 255.