The challenge of the Quran or Tahaddi (Arabic: , translit. al-tahaddi fi al-Quran), in Islamic theology, refers to a challenge proposed in the Quran. It requests non-Muslims among both humans and jinn (the spirits/demons) to produce either a chapter or multiple chapters like those within the holy book, with the aim of proving the Quran's superiority over any work. The Quran says that this is impossible to achieve.
Non-Muslims are challenged to produce a "statement" or speech similar to the Quran one verse, and challenged to produce either one or ten similar chapters in others. Another verse states that neither humans nor jinn could create a book like it, even if they were working together.
While the Quran itself does not explain what parameters people are meant to judge works attempting to meet the challenge by, Islamic scholars state that the challenge can never be fulfilled by any metric, as no one can compete with the wisdom of God. This view holds that the Quran is the most perfect book to ever exist. Muslims believe that this challenge was unable to be fulfilled in the era of Muhammad, and will remain unfulfilled until the end times. Some scholars attribute this to divine intervention, stating that God will prevent all those who attempt it from achieving their goal.
A number of people, both atheists and members of other religions, have nonetheless attempted to fulfill the challenge. Some individuals claim that their own holy books or secular works already meet or exceed the challenge, while others have created their own works to meet it. The True Furqan, a Christian work written in the style of Quranic Arabic, is one such attempt.