Tenure of seat of members (National Assembly)
Section 68(1)(d) · 1999 Constitution (2004 edition)
What Constitution says
(d) he becomes President, Vice-President, Governor, Deputy Governor or a Minister of the Government of the Federation or a Commissioner of the Government of a State or a Special Adviser.
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 49–50. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections