(1) Except as otherwise provided by this Constitution, any question proposed for decision in a House of Assembly shall be determined by the required majority of the members present and voting; and the person presiding shall cast a vote whenever necessary to avoid an equality of votes but shall not vote in any other case.
(2) Except as otherwise provided by this Constitution, the required majority for the purpose of determining any question shall be a simple majority.
(3) A House of Assembly shall by its rules provide -
(a) that a member of the House shall declare any direct pecuniary interest he may have in any matter coming before the House for deliberation;
(b) that the House may by resolution decide whether or not such member may vote or participate in its deliberations, on such matter;
(c) the penalty, if any, which the House may impose for failure to declare any direct pecuniary interest such member may have; and
(d) for such other matters pertaining to the foregoing as the House may think necessary, but nothing in this subsection shall enable any rules to be made to require any member, who signifies his intention not to vote on or participate in such matter, and who does not so vote or participate, to declare any such interest.
Section 98 of the Constitution of the Federal Republic of Nigeria