He sold something then it became apparent that it was no good

Question :

I am a man who sold something to another man one day. Then, eventually it became clear that the product was not suitable for his use and he tried to return it to me. However, I did not accept it from him. Then, he threw it at me and left, while knowing that when I sold it to him I thought that it was good and in working condition for use. I did not know that it was no good. So, now what is the position of the Islamic law regarding this transaction, and what is my position regarding this product? I hope for a beneficial answer regarding this, and I will be very grateful to you.

You are pardoned if you did not know that it was no good at the time of the agreement. Then, after he returned it and you learned that it was no good from the time before your sale, you should take it back and return its price to him. You may also make an agreement with him to exchange it for another that works or you may decrease some of the price as a penalty for the defect. Now, after the product has been returned, you must search for that buyer and reconcile with him in the manner that we have mentioned. If you do not know him, then you should give the money away in charity to the poor and intend the reward of charity for its owner. And Allâh gives success.

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