 then they said that every prophet has a period of his law and when his period ends god sends another prophet to abrogate his law. the period of the law of every prophet is seven ages which is seven centuries. the first of them is the speaking prophet and the meaning of speaking is that his law abrogates what came before him.
ثم انهم قالوا كل نبي لشريعته مدة فإذا انصرمت مدته بعث الله نبيا آخر ينسخ شريعته ومدة شريعة كل نبي سبعة أعمار وهوسبعة قرون فأولهم هو النبي الناطق ومعنى الناطق أن شريعته ناسخة لما قبله