Appointment of Chief Judge and Judges of the Federal High Court
Section 250(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) A person shall not be qualified to hold the office of Chief Judge of the Federal High Court unless he is qualified to practise as a legal practitioner in Nigeria and has been so qualified for a period of not less than ten years.
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 107–108. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections