Is it permissible to offer the owner a lump sum of 50,0 in exchange for waiving deferred payments, thereby forgoing 20,0, for the purchase of a commercial shop for which 70,0 of its 140,0 price has been paid, with the remaining 70,0 to be paid in ten installments over three years?

The scenario of "Waḍaʿ wa Taʿajjal" (where the debtor says to the creditor: "Reduce some of my debt, and I will pay you the rest promptly," or vice versa) is not permissible according to the general body of jurists and the practitioners of the four madhhabs. This is because it falls under the category of reduction in exchange for prompt payment, which carries the meaning of prohibited usury (riba). However, Imam Ahmad, in one of his narrations, and Ibn Taymiyyah, Ibn al-Qayyim, and Ibn Abbas disagreed, arguing that it is the opposite of usury. They contend that it involves absolving the debtor of part of the compensation in exchange for waiving the deferment, benefiting both parties. Furthermore, there is no textual evidence prohibiting it, nor is there a consensus, nor a sound analogy. The majority view is that a debtor who pays promptly on condition of a reduction in part of the debt is considered to be giving a loan, and every loan that yields a benefit is usury. There is a significant difference of opinion on this matter, with the majority leaning towards prohibition.