to demand payment from Sami, because the right has passed to the seller—namely, al-Tahir. Therefore, the seller may transfer Abd al-Rahman to Sami.
Al-Tahir has now become indebted to the buyer, Abd al-Rahman, so he transfers him to his debtor, Sami. Sami had been indebted to Abd al-Rahman, the buyer; then he became indebted to the seller, al-Tahir, who transferred him to him for the debt owed.
In the second case—the second example—the situation is the reverse: the seller transfers his debtor to the buyer.
For example, Abd al-Rahman buys a book from al-Tahir for ten riyals, so Abd al-Rahman becomes liable to al-Tahir for ten riyals. Sami was owed ten riyals by al-Tahir, so al-Tahir said to him, “I transfer you to Abd al-Rahman, the buyer.” If the sale is then rescinded, Sami will receive payment from the buyer, Abd al-Rahman; and in that case, the buyer, Abd al-Rahman, will transfer Sami to the seller, al-Tahir.