Okla. Stat. tit. 5, § 12
The Supreme Court of the State of Oklahoma shall have exclusive power and authority to pass upon qualifications and fitness of all applicants for admission to practice law in the State of Oklahoma, and the qualifications of such applicants shall be those which are now or may be hereafter prescribed by the statutes of Oklahoma and the rules of the Supreme Court.
Laws 1939, p. 68, § 1.