has the option to proceed or withdraw so long as they have not separated and are still together.” (1) And he said: “None of you should sell over the sale of another.” (2) There are many hadiths on this subject.
As for scholarly consensus, it is necessarily known to be part of the religion of Islam.
As for sound reasoning, a person needs the worldly goods in another person’s possession, and there is no means of obtaining them except through wrongdoing and forcibly taking them from him, or through sale.
It is therefore necessary for sales to be lawful, and so Allah—Exalted is He—made them lawful. The lawfulness of sales demonstrates the comprehensiveness of Islamic law and that it is not, as its enemies claim, limited to regulating dealings between the Creator and the created. Rather, it regulates dealings between the Creator and the created, as well as dealings among created beings themselves. Its regulation of dealings among people is among the most important of matters, for without it, people would consume one another’s wealth and transgress against one another. Thus, it is part of the wisdom and required by the justice of Allah—Exalted is He—that dealings among people be regulated, lest they be left to their whims and aggression.
Moreover, the longest verse in the Book of Allah is the verse concerning debt, and it deals with transactions among people. So how can it be claimed that Islamic law regulates only the relationship between the Creator and the created? For this reason, one of the polytheists said to Salman