What is the ruling on working for a real estate marketing company that offers properties through both cash and installment systems, and benefits from a commission from the buyer, knowing that the installment system is carried out through usurious banks or financing companies that adopt the Ijara-Muntahia-Bil-Tamleek (lease-to-own) contract, and the company is responsible for following up on transactions with these entities?

Brokerage (samsarah) is permissible under its Sharia-compliant conditions, whereas processing and following up on usurious loans in banks is a prohibited act, based on the Almighty's saying: "And do not cooperate in sin and aggression." The Prophet, peace and blessings be upon him, cursed the one who consumes usury, its giver, its two witnesses, and its scribe. It is not permissible to work in transactions of a usurious bank or in transactions of lease-to-own companies if their contracts are prohibited.