What is the ruling on dealing with margin in forex trading, taking into account that the loan from the brokerage company does not incur any interest, and the company's profit comes from the difference in buying and selling prices, and that the interest-free loan (Qard Hasan) aims to help clients with small capital?

The company grants the loan for the interest it earns from the price difference, and every loan that draws a benefit is usury (riba). Examples include a car company stipulating that its cars be distributed through it in exchange for a loan, or a forex company stipulating that transactions be conducted with it; this is considered usury. It was narrated from Ibn Mas'ud that "whatever is gained from the back of his horse is usury" in a loan that stipulated the benefit of the horse's back, and similarly, "every loan that draws a benefit is usury," meaning it stipulated something that brings a benefit to the lender. Furthermore, the benefit gained from the forex company is stipulated in the loan contract, as is the case with the car company that stipulates the distribution of cars through it. It has been explicitly stated that it is impermissible to combine a loan contract with a sales or lease contract, because it is a means to profit from a loan by taking more than what was given.