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ASPECTS OF FAIR DEALING
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“Do not envy each other. Do not inflate the bidding at auctions, do not bear a grudge, do not turn away from each other, and do not make an offer during (another's) pending transaction. Be worshipers of Allah, brothers to each other. Muslims are brothers to each other. He neither wrongs him, looks down upon him, nor humiliates him. Piety is a matter of the heart. He repeated this thrice.
It is evil for a person to look down upon his Muslim brother.
Everything belonging to a Muslim is forbidden to another Muslim; his blood, property, and his honor.”
Muslim with a chain up to Abu Hurairah who related that the Prophet, praise and peace be upon him, said this.