What is the legal status of a sale transaction conducted by an apostate according to Al-Shafi'i and Abu Yusuf?

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Al-Shafi'i and Abu Yusuf maintain that the apostate's disposition is valid in both states (apostasy or return to Islam), and the right of preemption must be enforced upon the sale. The basis for enforcing preemption in this context rests upon the validity of the apostate's transaction.