If I bought something from a shop and they made a mistake and gave it to me at a lower price, is it obligatory for me to return the amount?
Machine translationRead the Arabic original
The questioner : Well, if I went to the shop one day and took something from them, I found a young boy selling, his son is selling in the shop, I bought it from him and I noticed a deficiency in the price, meaning for example it was forty-five and I took it from him for twenty-five.
The Shaykh : So, do I return it?
The questioner : Do I come once and give it, or do I come a second time and give it to the father, or is that it?
The Shaykh : No, no, I go and give him the money.
The questioner : I give it to his father.
The Shaykh : I give it to the family, yes, perhaps the boy does not know.
The presenter : Well, may Allah reward you with good, goodbye.
The Shaykh : So, do I return it?
The questioner : Do I come once and give it, or do I come a second time and give it to the father, or is that it?
The Shaykh : No, no, I go and give him the money.
The questioner : I give it to his father.
The Shaykh : I give it to the family, yes, perhaps the boy does not know.
The presenter : Well, may Allah reward you with good, goodbye.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 312- لو اشتريت شيئاً من محل واخطأ واعطاني بسعر اقل هل يجب ان ارجع المبلغ — youtube.com
The Arabic text is a machine transcription of the audio recording.