“11. It may be mentioned here that Muslim Jurisprudence, where theology and moral concepts are found sometimes mingled with secular utilitarian legal principles, contains a very elaborate theory of acts which are good (because they proceed from 'hasna'), those which are bad (because, they exhibit "qubuh"), and those which are neutral per se. It classifies them according to 'varying degrees of approval or disapproval attached to them (see Abdur Rahim's "Muhammadan Jurisprudence" P. 105). The renunciation of a supposed right, based upon an expectancy, could not, by any test found there, be considered "prohibited". The binding force in 'future of such a renunciation would, even according to strict Muslim Jurisprudence, depend upon the attendant circumstances and the whole course of conduct of which it forms a part.. I In other words, the principle of an equitable estoppel, far from being opposed to any principle of Muslim law will be found, on investigation, to be completely in consonance with it.