Should one refuse a car purchase bonus where the company covers half the cost, knowing that this half will be borrowed from an interest-based bank?

It is impermissible to accept this bonus, as it involves acknowledging usurious transactions and assisting in their completion. Allah Almighty says: "The believing men and believing women are allies of one another. They enjoin what is right and forbid what is wrong." And He, Exalted be He, says: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression."