Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Don't nurse grudge and don't bid him out for raising the price and don't nurse aversion or enmity and don't enter into a transaction when the others have entered into that transaction and be as fellow-brothers and servants of Allah. A Muslim is the brother of a Muslim. He neither oppresses him nor humiliates him nor looks down upon him. The piety is here, (and while saying so) he pointed towards his chest thrice. It is a serious evil for a Muslim that he should look down upon his brother Muslim. All things of a Muslim are inviolable for his brother in faith: his blood, his wealth and his honour.
Reference: Sahih Muslim 2564 a In-book : Book 45, Hadith 40 USC-MSA web (English) : Book 32, Hadith 6219 (deprecated)
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