Okla. Const. art. XI, § 3

Interest and income - Use and apportionment. The interest and income of the permanent school fund, the net income from the leasing of public lands which have been or may be granted by the United States to the State for the use and benefit of the common schools, together with any revenues derived from taxes authorized to be levied for such purposes, and any other sums which may be added thereto by law, shall be used and applied each year for the benefit of the common schools of the State, and shall be, for this purpose, apportioned among and between all the several common school districts of the State in proportion to the school population of the several districts, and no part of the fund shall ever be diverted from this purpose, or used for any other purpose than the support and maintenance of common schools for the equal benefit of all the people of the State.