What is the ruling on the legal status (Islam/disbelief) of an abandoned infant (Laqit) found in a Dar al-Islam (Land of Islam) established by Muslims, such as Baghdad or Basra?

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The abandoned infant found in a land established by Muslims, such as Baghdad or Basra, is ruled to be a Muslim. This ruling is maintained even if people of protection (Ahl al-Dhimma) reside there, based on the principle that Islam prevails and is not overcome. This comprehensive detail is the established position of the Shafi'i school.