http://www.leginfo.ca.gov/cgi-bin/displaycode?section=bpc&group=06001-07000&file=6060-6069

6067. Every person on his admission shall take an oath to support the Constitution of the United States and the Constitution of the State of California, and faithfully to discharge the duties of any attorney at law to the best of his knowledge and ability. A certificate of the oath shall be indorsed upon his license.