Missouri Constitution
Article IX - Education
Section 8 Prohibition of public aid for religious purposes and institutions.

Neither the general assembly, nor any county, city, town, township, school district or other municipal corporation, shall ever make an appropriation or pay from any public fund whatever, anything in aid of any religious creed, church or sectarian purpose, or to help to support or sustain any private or public school, academy, seminary, college, university, or other institution of learning controlled by any religious creed, church or sectarian denomination whatever; nor shall any grant or donation of personal property or real estate ever be made by the state, or any county, city, town, or other municipal corporation, for any religious creed, church, or sectarian purpose whatever.

Source: Const. of 1875, Art. IX, Sec. 11.