Declaration of assets and liabilities; oaths of Ministers
Section 149 · 1999 Constitution (2004 edition)
What Constitution says
A Minister of the Government of the Federation shall not enter upon the duties of his office, unless he has declared his assets and liabilities as prescribed in this Constitution and has subsequently taken and subscribed the Oath of Allegiance and the oath of office for the due execution of the duties of his office prescribed in the Seventh Schedule to 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 74–75. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections