1. What is the purpose of creating the humans and the jinn? 

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Allah created the humans and jinn to order them to worship Him. 

Suratul-Dhariyat, Ayah 56 means, “Allah has created jinn and mankind, only to order them to worship Him.” The Prophet, sallallahu ^alayhi wa sallam, said, “The greatest right due to Allah from his slaves is for them to worship Him without associating partners to Him.” (Related by al-Bukhariyy and Muslim)