and to trade in it, the sale is permissible if conducted in a lawful manner. But if his aim is to obtain dirhams, so he buys it for one hundred payable later and sells it in the market for seventy paid immediately, this is blameworthy and prohibited according to the stronger of the scholars’ two views. This is called “tawarruq.” ʿUmar ibn ʿAbd al-ʿAzīz—may Allah be pleased with him—said:

“Tawarruq is the sister of usury.”

He was asked:

A man asks someone for a commodity worth fifteen, and the latter says that he will only sell it for twenty-eight. Is it permissible for the buyer to purchase it, knowing of the increase?

He replied:

If the buyer needs dirhams and purchases the commodity in order to sell it and receive its price, this is called “tawarruq.” If the buyer’s purpose is to obtain silver money, this is blameworthy according to the stronger of the scholars’ two views, as ʿUmar ibn ʿAbd al-ʿAzīz said:

“Tawarruq is the sister of usury.”

Ibn ʿAbbās said:

“If you value it at a cash price and then sell it on deferred payment, that is dirhams exchanged for dirhams.”

This is one of the two positions reported from Ahmad.