Appointment of Grand Kadi and Kadis of the Sharia Court of Appeal of the Federal Capital Territory, Abuja
Section 261(4) · 1999 Constitution (2004 edition)
What Constitution says
(4) If the office of the Grand Kadi of the Sharia Court of Appeal is vacant or if the person holding the office is for any reason unable to perform the functions of the office, then, until a person has been appointed to and has assumed the functions of that office or until the person holding the office has resumed those functions, the President shall appoint the most senior Kadi of the Sharia Court of Appeal to perform those functions.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 111. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections