Is it permissible to use the free books allocated to needy students after the beneficiary is no longer considered needy, given the father's need to get rid of debts and his inability to purchase books?

It is permissible to benefit from a grant provided to needy students if the conditions of the granting authority are met. The fact that the father may have become affluent after the grant was received does not affect the permissibility of benefiting from it, because upon its acquisition, it becomes complete and owned by the beneficiary. This grant is, in essence, a gift, and it becomes binding upon its receipt with the permission of the donor. Therefore, it is permissible to benefit from the books and money that were received before the change in financial status.