Disqualifications (House of Assembly)
Section 107(1)(a) · 1999 Constitution (2004 edition)
What Constitution says
(a) subject to the provisions of Section 28 of this Constitution, he has voluntarily acquired the citizenship of a country other than Nigeria or, except in such cases as may be prescribed by the National Assembly, has made a declaration of allegiance to such a country;
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 59–60. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections