Revenue bonds issued under the provisions of Sections 69-5-15 and 69-5-19 shall not be deemed to constitute a debt of the State of Mississippi or a pledge of the full faith and credit of the state, but such bonds shall be payable solely from the special revenues provided therefor as hereinabove set forth, and the issuance of such revenue bonds shall not directly, indirectly, or contingently obligate the state to levy or pledge any form of taxation whatever therefor, and all such bonds shall contain recitals on their face substantially covering the foregoing provisions of this section.