Authorisation of expenditure from Consolidated Revenue Fund
Section 81(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) The heads of expenditure contained in the estimates (other than expenditure charged upon the Consolidated Revenue Fund of the Federation by this Constitution) shall be included in a bill, to be known as an Appropriation Bill, providing for the issue from the Consolidated Revenue Fund of the sums necessary to meet that expenditure and the appropriation of those sums for the purposes specified therein.
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 52. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections