Muslims are obliged to know the nature of Allah as the basis of the foundation of faith, otherwise the human being does not fully know Allah as the Creator (Makrifatullah), the opening for the way to know Allah by knowing and understanding the nature of Allah. It is obligatory for every mukallaf and Muslim to believe that there are some attributes of infinite perfection for Allah. So, it is also obligatory to believe in the twenty attributes of Allah and it is also necessary to know the attributes that are impossible for Allah. The nature that is impossible for Allah is the opposite of the obligatory nature. The obligatory nature is also divided into four parts, namely nafsiah, salbiah, ma'ani or ma'nawiah. Then believe in the obligatory qualities of Rasulullah as the messenger of Allah. The characteristics above are classified into 3, namely Mandatory, Impossible and Jaiz for Allah and His Messenger.

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