What are the valid conditions for the validity of the *Musāqāh* (sharecropping/fruit cultivation contract)?

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The *Musāqāh* contract is valid only when the trees are specified either through direct sight or by a specific attribute that leaves no ambiguity, similar to the conditions for a valid sale. The validity hinges on the certainty of the subject matter, as uncertainty renders the contract void, just as in a sale.