Mo. Rev. Stat. § 108.150: Refunding bonds — provision for payment of interest and principal.

Any county, city, school district, or other political corporation or subdivision of the state, issuing its bonds for the purposes aforesaid shall, at the time of issuing the same, provide for the payment of the interest on and the principal of such refunding bonds, in the same manner as was provided for the payment of interest on and principal of the bonds refunded thereby.