Remuneration, etc. of the President and certain other officers
Section 84(6) · 1999 Constitution (2004 edition)
What Constitution says
(6) Any pension granted by virtue of subsection (5) of this section shall be a charge upon the Consolidated Revenue Fund of the Federation.
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 53–54. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections