His statement: “Or the buyer stipulates that the seller deliver the firewood.” The definite article in “the firewood” refers to a specific item understood by both parties: namely, the firewood that was sold.

For example, he purchases firewood from him and says, “On condition that you deliver it to my house,” and his house is known to be in such-and-such a location. This is valid.

If someone asks: What is the proof?

We say: We have the general evidence in the Prophet’s saying, “Muslims are bound by their conditions” (1). By analogy, it is like the seller stipulating that the buyer provide a known benefit relating to the item sold. However, if he stipulates that the seller deliver other firewood, not the firewood sold, then this is not permissible.

His statement: “Or break it up.” He stipulates that he break it up. Delivery is the buyer’s responsibility, while here he is only to “break it up.”

His statement: “Or sew the garment.” He stipulates that the person from whom he bought the cloth sew the garment. This condition is valid, because it is a known benefit relating to the item sold.

His statement: “Or cut it out,” meaning, cut out the garment. Cutting out is distinct from sewing. If he stipulates both sewing and cutting it out, this will come later in the author’s discussion.

“However, if he combines two conditions, the sale is invalid; …”

His statement: “If he combines two conditions, the sale is invalid,” meaning, if he combines the two conditions mentioned in his statement, “when the seller stipulates residence in the house,” then it renders the sale invalid.