Constitution of the Islamic Republic of Pakistan, 1973 — Article 181

181. Acting Judges..—(1) At any time when

(a)the office of a Judge of the Supreme Court is vacant; or

(b)a Judge of the Supreme Court is absent or is unable to perform the functions of his office due to any other cause, the President may, in the manner provided in clause (1) of Article 177, appoint a Judge of a High Court who is qualified for appointment as a Judge of the Supreme Court to act temporarily as a Judge of the Supreme Court. [Explanation.__ In this clause, ‘Judge of a High Court’ includes a person who has retired as a 3 Judge of a High Court.]

(2)An appointment under this Article shall continue in force until it is revoked by the President.