What is the ruling on selling goods favored by the needy at a deferred price, with an increase over their immediate price, after purchasing them for them without a prior agreement? And what is the ruling if an agreement is made with them beforehand to purchase and obligate them to do so? And what is the ruling on authorizing them to purchase the goods, then selling them to them at a deferred price with an increase after they have taken possession of them?

There is no harm in selling an item for a deferred price that is higher than its cash price, because the deferment has a share in the price. This is permissible after the item has entered into the possession of the seller.

However, it is not permissible to agree to purchase an item and specify its deferred price as a binding agreement before the item has been bought and entered into the guarantee of the agent, because this is selling what one does not own.

It is permissible to agree on specifying the price and specifications, provided that the sale does not take place until the item has entered into the possession and guarantee of the agent. There is no difference whether the agent undertakes to buy it himself or appoints someone else, even if the appointed person is the instructing party himself.