Miss. Code § 9-1-25
It shall not be lawful for any judge of the Supreme Court, Court of Appeals or a judge of the circuit court, or a chancellor to exercise the profession or employment of an attorney or counsellor at law, or to be engaged in the practice of law; and any person offending against this prohibition shall be guilty of a high misdemeanor and be removed from office; but this shall not prohibit a chancellor or circuit judge or a judge of the Court of Appeals from practicing in any of the courts for a period of six (6) months from the time such judges or chancellors assume office so far as to enable them to bring to a conclusion cases actually pending when they were appointed or elected in which such chancellor or judge was then employed, nor shall a judge of the Supreme Court be hindered from appearing in the courts of the United States in any case in which he was engaged when he was appointed or elected judge.
Miss. Code § 9-1-25