The Government and the people
Section 14(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) It is hereby, accordingly, declared that: (a) sovereignty belongs to the people of Nigeria from whom government through this Constitution derives all its powers and authority; (b) the security and welfare of the people shall be the primary purpose of government: and (c) the participation by the people in their government shall be ensured in accordance with the provisions of this Constitution.
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