What is the ruling of Islamic law regarding the actions of the organizing company, the management company, and the supplying company, in arranging exhibitions for the installment sale of durable goods through a usurious bank, knowing that the price of the exhibited good is the value of the monthly installment paid by the customer to the bank?

The actions of the company organizing the exhibition, specifically its agreement with a usurious bank to finance installments, are impermissible (haram) because they constitute an effort to ensnare people in usury. As for the other activities carried out by the exhibition organizing company, the management company, and the supplying company, they are permissible in principle. However, they become forbidden if they aid in usurious transactions, in accordance with the Almighty's saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression." The Sharia-compliant solution for this is Murabaha to the one who commands the purchase.