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

Question:
And among the prophets, if we are guided, a narrator mentions that with the rabbits, he bought his goods, and the collection of these goods was displayed and specified, but his role allowed him to reduce the price of these goods for the practice, so does he deserve what he wanted from these goods?

Answer:
No, he does not deserve what was reduced 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. May Allah be pleased with both of them. Urwah al-Barqi returned to the Messenger (peace and blessings be upon him) what remained of the blood. He did not say this to me. Did you entrust me with a sheep and you have a sheep? As for the basil, no. Is this the result of my sale by purchase? No, this is forbidden; it is not permissible. Because you bought them with the intention of so-and-so, and with the money of so-and-so, so it is not permissible for you to deceive this tribe.