to one due after two months, or a debt due after two months to one due after one month, because their due dates differ. Nor may he transfer a deferred debt to one that is immediately due, again because their due dates differ.
This too is open to question. What could prevent one from transferring ten dirhams due after one month to ten dirhams not due until after two months, if the transferee agrees? There is no harm whatsoever in this, and the correct view is that it is permissible.
Someone may say: “Does this not resemble selling dirhams for dirhams on deferred payment?”
The answer is that this is not a sale; rather, it is the settlement of a debt. It is well known that there is nothing wrong with paying a deferred debt early or deferring one that is immediately due. The correct view, then, is that it is not a condition for the two debts to have the same due date.
The fourth matter is the amount: it is likewise stipulated that the two debts be equal in amount. Thus, he may not transfer a debt of ten to one of eight, because this resembles a sale, and a sale involving an excess is not permissible. However, if he remits two and transfers him to someone for eight, this is permissible, because once he has remitted the two, the amount owed to him is eight. Therefore, when he transfers him for that amount to someone who owes him eight, the two amounts are equal.
As for transferring eight to ten, there is no harm in that. This is why the author said: “The surplus does not matter,” meaning the excess owed by the transferee of the transfer. There is no problem with this, because it is as though he has transferred him to eight out of ten. This is permissible, and this is the meaning of his statement, “The surplus does not matter”: the remainder stays with its owner.
But if he says, “I have transferred you for eight to ten, so that you may collect the entire ten,” this is not permissible, because it has become an exchange. In an exchange between two ribā-bearing items, each must be equal to the other when they are of the same type,