If a person gives you a sum of money to buy a commodity, is it obligatory to return the excess money?

Question : Okay, in a second question? Yes, she says: Shaykh, if the commodity is sold for one hundred, and this sister gave her the one hundred and she bought it for her for sixty, does she return the remaining forty?

Answer : Yes, it is obligatory for her to return the remaining forty. And if the one who appointed her permits her to take it, there is no harm. For example, if a person says to another, "Here is one hundred riyals, buy me a garment for my daughter, such and such," and he buys the garment for sixty riyals, it is obligatory for him to return the forty to its owner. However, if he says, "Buy me a garment for whatever you want, and the excess is yours," then there is no harm. Similarly, if he says, "Sell this garment for one hundred, and whatever is more is yours," then there is no harm.

The presenter : May Allah reward you. As for if he says, "Whatever is more is yours, and whatever is less is upon you," then that is not permissible. May Allah reward you with good, O Shaykh. Thank you to the sister who asked. May Allah reward you.