the first is that the person swearing the oath should have been aware of the danger of the oath and the possibility that it may include deception and trickery so he mentioned to himself after that the exception which is his saying god willing so it is not binding and he is not prevented from breaking the oath. if he breaks the oath he is not obligated to break the oath at all. this is the ruling on every oath that is followed by the word of exception such as his saying by god i will do suchandsuch god willing and his saying if i do suchandsuch then my wife is divorced god willing and what is similar.
الأول أن يكون الحالف قد تنبه لخطر اليمين وإمكان اشتماله على تلبيس وخداع فذكر في نفسه عقيب ذلك الاستثناء وهو قوله أن شاء الله فلا ينعقد ولا يمتنع عليه الحنث وإذا حنث لم يلزمه بالحنث حكم أصلا وهذا حكم كل يمين أردف بكلمة الاستثناء كقوله والله لأفعلن كذا أن شاء الله وكقوله أن فعلت كذا فزوجتي طالق أن شاء الله وما جرى مجراه