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As for their claim that salam (a sale against advance payment) is contrary to analogy, this resembles their report that the Prophet, may Allah bless him and grant him peace, said:

“Do not sell what you do not have,”

and granted a concession for salam. This latter statement is not transmitted in the hadith; rather, it is the wording of some jurists. They reasoned that salam involves selling what one does not have and is therefore contrary to analogy.

The Prophet’s prohibition to Hakīm ibn Hizām against selling what he did not have may refer to selling a specifically identified item, in which case he would be selling someone else’s property before purchasing it—though this interpretation is open to question. Alternatively, it may refer to selling something one cannot deliver, even if it is owed as a contractual obligation. This interpretation is more plausible: he would be undertaking to supply something without knowing whether he could obtain it. This applies to salam with immediate delivery when the seller does not have what he needs to fulfil his obligation, and the rationale here is evident.

As for salam with deferred delivery, it is simply a debt, like other debts, and resembles a purchase with deferred payment. What difference is there between one consideration being owed as a deferred obligation and the other being owed in the same way?

Allah Most High says:

“When you contract a debt for a specified term, write it down.”

Ibn 'Abbās said: “I testify that a guaranteed sale against advance payment