神圣的律法由真主启示给祂的使者，目的在于纠正人类关于真主的信仰（'aqeedah，信条），纠正人类敬拜真主的方式（'ibaadah，崇拜），以及纠正人类的社会生活和社会行为（mu'aamalah，交易往来）。由于关于真主的正确信仰只有一种，即独一（tawheed，认主独一），真主在本质、属性、行为以及敬拜的权利上都是独一无二、无有同伴的，因此所有先知都以完全相同的方式邀请人类归信这一信仰。真主在《古兰经》中向穆罕默德ﷺ确认了这一事实，经文说：

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,