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In page Jihad:

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According to some authors, the more spiritual definitions of jihad developed sometime after the 150 years of jihad wars and Muslim territorial expansion, and particularly after the Mongol invaders sacked Baghdad and overthrew the Abbasid Caliphate.[citation needed][1] Historian Hamilton Gibb stated, "in the historic [Muslim] Community the concept of jihad had gradually weakened and at length it had been largely reinterpreted in terms of Sufi ethics."[2]: 117  notes that "despite the theoretical importance of the idea of jihad in classical Islamic juristic thought", by the time of the Abbasids, the concept was no longer central to statecraft.[3]