Mo. Rev. Stat. § 492.030
Current with changes from the 2023 Legislative Session
Every person who shall declare that he has conscientious scruples against taking an oath or swearing in any form shall be permitted to make his solemn declaration or affirmation in the following form: "You do solemnly declare and affirm", etc., concluding with the words "under the pains and penalties of perjury".
§ 492.030, RSMo
RSMo 1939 § 1881