Is it permissible to participate in financing the purchase of medical devices directly from their manufacturers, with the buyer paying in installments over a certain period, in exchange for profits that accrue to the financier, while the other partner takes their full profit?

This transaction is considered prohibited usury (riba), because it involves paying the price of the commodity to the buyer and recovering the money with an increase over installments. This takes one of two forms: either lending the friend the price of the device with an increase, or buying the debt that your friend has on the customer with a deferred increase. The latter combines riba an-nasi'a (usury of delay) and riba al-fadl (usury of surplus). Muslims have unanimously agreed on the prohibition of usurious loans, as any stipulated increase in a loan is considered usury.

There are two permissible Islamic solutions for this transaction:

1. The first is that the friend refers the customer to you, then you buy the commodity for yourself, take possession of it, and then sell it to the customer in installments with a profit. Your friend is permitted to take a commission for referring the buyer. 2. The second is that you partner with your friend in buying the device and divide the profit from selling it in installments.