Al-Tirmidhi said (14): This is a sound (sahih) hadith. This is from the buyer's liability, so his yield must belong to him. Furthermore, since ownership is transferred by the sale (15), as we have mentioned, its growth must belong to him, just as it does after the expiration of the option period. It is possible to derive that the separate growth belongs to the seller if they rescind the contract, based on the report in which we said: ownership is not transferred. As for connected growth, it is secondary to the sold item, whether they execute the contract or rescind it, just as it follows it in the case of return due to defect or mutual rescission (muqayala).

Section: The liability for the sold item lies with the buyer once he takes possession of it, provided it is not measured by volume or weight. If it perishes, diminishes, or a defect occurs in it during the option period, it is his responsibility because it is his property, its yield is his, and thus it is his liability, just as it is after the expiration of the option period, and its maintenance is upon him. If it is a slave and the new moon of Shawwal appears, his Zakat al-Fitr is upon him for that reason. If he buys a pregnant animal, and it gives birth while in his possession during the option period, then he returns it to the seller, he is obligated to return its offspring; for it is a sold item in which a connected increase has occurred, so he is obligated to return it with its increase, just as if he had bought two slaves and one of them grew fat while in his possession. Al-Shafi'i said in one of his two opinions: He does not return the offspring; for the fetus has no legal status, as it is a part connected to the mother, so it does not take a portion of the price, like her limbs. Our evidence is that everything upon which the price is distributed when it is separate is also distributed upon it when it is connected, like milk. What they argued is invalidated by an undivided share, such as a third or a quarter, and the legal principle in the root is disputed. Furthermore, the fetus is distinct from the limbs because it will eventually be separated, it is benefited from when separate, it is valid to emancipate it individually, or bequeath it to or from it, it inherits if it is among those eligible for inheritance, it is assigned a specific blood money (diya) payment, and its heirs inherit it. Their statement that the fetus has no legal status is invalid due to these rulings and others that we have mentioned elsewhere.