Is a major company that has undertaken to pay salaries and dues entitled to refuse to pay the remainder of a salary to an employee on the grounds that he works for the first company, despite the first company's confirmation of the amount due and the employee's work exclusively on the major company's projects?

If the large company pledges to the second company to pay its employees' salaries, then it must fulfill this pledge, especially if it caused the second company to incur costs, in accordance with the Almighty's saying: "And fulfill the covenant; indeed, the covenant will be questioned," and the Prophet's (peace be upon him) saying: "If he pledges, he betrays." The sin is compounded if the large company owes the second company and delays payment, in accordance with the Prophet's (peace be upon him) saying: "Delay by the rich is injustice," and "The delay of the solvent makes his honor and punishment permissible."