Sheria za kimungu zilifunuliwa na Allaah kwa wajumbe Wake kwa madhumuni ya kurekebisha imani ya mwanadamu kuhusu Mungu ('aqeedah), njia zake za kumwabudu Mungu ('ibaadah), na maisha yake ya kijamii au mwenendo wake wa kijamii (mu'aamalah). Kwa kuwa kuna imani moja sahihi kuhusu Mungu, ambayo ni tawheed, ambapo Allaah anachukuliwa kuwa Mmoja, bila mshirika katika dhati Yake, sifa Zake, vitendo Vyake, na haki ya kuabudiwa, manabii wote waliwaalika wanadamu kwenye imani hiyo kwa namna ile ile. Allaah alithibitisha ukweli huu kwa Nabii Muhammad ﷺ katika Qur'aan, akisema,

Dvine laws were revealed by Allaah to His messengers for the purpose of correcting man’s beliefs about God (‘aqeedah), his methods of worshipping God (‘ibaadah), and his social life or social conduct (mu‘aamalah). Since there is only one correct belief about God, tawheed, whereby Allaah is considered as One, without partner in His essence, His attributes, His actions, and right of worship, all of the prophets invited mankind to that belief in exactly the same way. Allaah confirmed this fact to Prophet Muhammad (ﷺ) in the Qur’aan, stating,