and that the cheque in question was issued for the second time after the earlier cheques were dishonoured and that even according to the accused some amount was due and payable, there is a presumption under Section 139 of the NI Act that there exists a legally enforceable debt or liability. Of course, such a presumption is rebuttable. However, to rebut the presumption, the accused was required to lead evidence that the full amount due and payable to the complainant had been paid. In the present case, no such evidence has been led by the accused. The story put forward by the accused that the cheques were given by way of security is not believable in the absence of further evidence to rebut the presumption, and more particularly, the cheque in question was issued for the second time after the earlier cheques were dishonoured. Therefore, both the courts below have materially erred in not properly appreciating and considering the presumption in favour of the complainant that there exists a legally enforceable debt or liability as per Section 139 of the NI Act. It appears that both the learned trial court as well as the High Court have committed an error in shifting the burden upon the complainant to prove the debt or liability, without appreciating the presumption under Section 139 of the NI Act. As observed above, Section 139 of the Act is an example of a reverse onus clause and therefore, once the issuance of the cheque has been admitted and even the signature on the cheque has been admitted, there is always a presumption in favour of the complainant that there exists legally enforceable debt or liability and thereafter, it is for the accused to rebut such presumption by leading evidence.”