Is the sale of a pregnant female slave valid?

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The sale of a pregnant female slave is valid. The sold item (the female slave) is known, and the uncertainty regarding the fetus does not invalidate the contract because the fetus is neither the object of the sale nor explicitly excluded by wording. This is analogous to cases where something is implicitly excluded by religious law (Shari'ah) even if it cannot be excluded by explicit wording, such as selling a married female slave, where the right to conjugal relations is implicitly excluded by the Law.