The Messenger of Allah ﷺ said, "Do not envy one another, do not inflate prices against one another, do not hate one another, do not turn your backs on one another, and do not undercut one another in business. Be servants of Allah, brothers to each other. A Muslim is the brother of a Muslim. He does not wrong him, abandon him, or despise him. Piety is here," and he pointed to his chest three times. "It is enough evil for a person to despise his Muslim brother. Every Muslim is sacred to another Muslim, his blood, his property, and his honor."
قال رسول الله ﷺ: لا تحاسدوا، ولا تناجشوا، ولا تباغضوا، ولا تدابروا، ولا يبع بعضكم على بيع بعض، وكونوا عباد الله إخوانا، المسلم أخو المسلم، لا يظلمه، ولا يخذله، ولا يحقره، التقوى هاهنا، ويشير إلى صدره ثلاث مرات، بحسب امرئ من الشر أن يحقر أخاه المسلم، كل المسلم على المسلم حرام، دمه وماله وعرضه.
Muslim narrated it in "Virtue, Kindness, and Manners" (2564) from Abdullah bin Maslama bin Qanab, who said, Dawud, meaning Ibn Qays, narrated to us, from Abu Saeed, the freed slave of Amir bin Kurayz, from Abu Hurairah, who said, and then he mentioned it.