The Criterion (Between the Allies of the Most Merciful and the Allies of the Devil) , by Ibn Taymiyyah, here translated to English.
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Ibn Taymiyyah / Dr. Hassan El Rashid
Islaam Publications Intl, Australia, 2001
Early Work - Islam - Creed
Indeed the enmity between man and Shaytaan is old, commencing from the time that Adam (alayhi as-salaam) was created û from the time he was ordered to prostrate to him. Shaytaan refused, become arrogant and hence disobeyed his Lord. His arrogance and pride let him to commit a whole host of sins, it made him expend every effort in misleading the children of Adam and made him beautify and embellish sins such that they accepted them and eagerly committed them. Books sent the Messenger and enjoined His servants to various injunctions and admonitions in order to secure them from the evil of Shaytaan. In the light of His advice, profound injunctions and admonitions in order to secure them from the evil of Shaytaan. In the light of His advice, profound injunctions and sever warnings, mankind becomes separated into two groups: a group who were guided and a group who deserved to be misguided. The groups who were guided are the inhabitants of Paradise and the groups who were misguided are the denizens of the Fire. The inhabitants of Paradise are the Awliyaa of the Most Merciful and the denizens of the Fire are the Awliyaa of Shaytaan.