The bonds and other obligations of any district incorporated under this article shall not be a debt or obligation of the State of Alabama nor a debt or obligation of any municipality which is a member of the district; and neither the state nor any such municipality shall be liable in any way whatsoever thereon, nor may the holder of any such bonds or obligations compel the levy of any taxes for the payment thereof.
Said bonds shall not be payable out of any funds other than the revenues of the gas system or systems of the district issuing the same, and each bond shall contain a recital to that effect. Neither the members of the board of directors nor any person executing said bonds shall be liable personally on said bonds by reason of the issuance thereof.