Section 92Local Government Code of 1991 (Republic Act No. 7160), Sec. 92

Oath of Office. - (a) All elective and appointive local officials and employees shall, upon assumption to office, subscribe to an oath or affirmation of office in the prescribed form. The oath or affirmation of office shall be filed with the office of the local chief executive concerned. A copy of the oath or affirmation of office of all elective and appointive local officials and employees shall be preserved in the individual personal records file under the custody of the personnel office, division, or section of the local government unit concerned.