What is the ruling on whomever

Q: Your Eminence, sometimes traders agree with the buyer that the latter may return the goods, but he can not ask for a refund. Rather, the buyer has to choose something that he likes from the goods that are available in the store and its cost should equal the refund. When he cannot find anything appealing, the seller gives him a voucher bearing the value of his refund that can be used whenever he wants to buy something from this store. What is your opinion on this act?

A: It is permissible to state the condition of having a choice to sell for a specified term. The buyer has the right to return the goods within this time frame, subject to this condition, and take a refund. However, stipulating that the buyer may not seek a refund but has to buy some other goods from the store, is null and void. This practice should be disregarded due to the saying of the Prophet (peace be upon him): Any condition that is not in the book of Allah is null even if they were a hundred conditions May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!