The ruling on what an agent deducts from the price of goods

Question:
And among such cases is when we take a person from among the members to buy goods on credit, and part of these goods is displayed and renewed, but if he is able to reduce the price of these goods through negotiation, does he deserve the portion of the goods he wanted?

Answer:
No, he does not deserve what he deducted from the price of the goods due to his bargaining and haggling with the seller. He does not deserve that; rather, he must return to the seller whatever remains of the price. This is like Urwah al-Bariqi, who returned to the Messenger of Allah (peace and blessings be upon him) what remained of the price. He did not say, "This is for me? You appointed me to buy a sheep, and I bought a sheep." The seller says, "No, this is the result of my sale." No, we say, "No, this is forbidden (haram) and not permissible, because you bought it with the intention of so-and-so, and with the money of so-and-so, so it is not permissible for you to deceive in this manner."