The Government and the people
Section 14(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) The composition of the Government of the Federation or any of its agencies and the conduct of its affairs shall be carried out in such a manner as to reflect the federal character of Nigeria and the need to promote national unity, and also to command national loyalty, thereby ensuring that there shall be no predominance of persons from a few State or from a few ethnic or other sectional groups in that Government or in any of its agencies.
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 26. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections