Sahih Muslim Book 025, Hadith Number 5339.

Chapter : It is forbidden to call the ruler as the king of kings or Shahanshah.

Abu Huraira reported from Allah's Messenger (may peace be upon him) so many ahadith and one of them was this that Allah's Messenger (may peace be upon him) said: The most wretched person in the sight of Allah on the Day of Resurrection and the worst person and target of His wrath would of the person who is called Malik al-Amlak (the King of Kings) for there is no king but Allah.

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