A levy with respect to Bonds issued prior to July 1, 1993 (or to refund or continue the refunding of Bonds issued prior to July 1, 1993) shall be for the sole benefit of holders of Bonds issued prior to July 1, 1993 (or to refund or continue the refunding of Bonds issued prior to July 1, 1993). A levy with respect to Bonds issued on or after July 1, 1993 (other than to refund or to continue the refunding of Bonds issued prior to July 1, 1993) shall be for the sole benefit of owners of Bonds issued on or after July 1, 1993 (other than to refund or to continue the refunding of Bonds issued prior to July 1, 1993). Proceeds of taxes levied under this Section shall be deposited in the debt service fund relating to the Bonds with respect to which the taxes were levied.
105 ILCS 5/34A-503