Sunnah.com reference : Book 16, Hadith 60English translation : Book 16, Hadith 1539Arabic reference : Book 16, Hadith 1496
Abu Hurairah [RAA) narrated that the Messenger of Allah (ﷺ) said:
“Avoid jealousy between yourselves, do not outbid one another (with a view to raising the price), do not harbor hatred against one another, do not bear enmity against one another, one of you should not enter into a transaction when the other has already entered into it; and be fellow brothers and slaves of Allah. A Muslim is a Muslim’s brother. He does not wrong, desert or despise him. Piety is found here (pointing three times to his chest), despising his Muslim brother is enough evil for any man to do. Every Muslim’s blood, property and honor are unlawful to be violated by another Muslim.” Related by Muslim.
وَعَنْهُ قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ لَا تَحَاسَدُوا وَلَا تَنَاجَشُوا, وَلَا تَبَاغَضُوا, وَلَا تَدَابَرُوا, وَلَا يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ, وَكُونُوا عِبَادَ اَللَّهِ إِخْوَانًا, اَلْمُسْلِمُ أَخُو اَلْمُسْلِمِ, لَا يَظْلِمُهُ, وَلَا يَخْذُلُهُ, وَلَا يَحْقِرُهُ, اَلتَّقْوَى هَا هُنَا, وَيُشِيرُ إِلَى صَدْرِهِ ثَلَاثَ مِرَارٍ, بِحَسْبِ اِمْرِئٍ مِنْ اَلشَّرِّ أَنْ يَحْقِرَ أَخَاهُ اَلْمُسْلِمَ, كُلُّ اَلْمُسْلِمِ عَلَى اَلْمُسْلِمِ حَرَامٌ, دَمُهُ, وَمَالُهُ, وَعِرْضُهُ }  أَخْرَجَهُ مُسْلِمٌ.‏  1‏ .‏‏1 ‏- صحيح.‏ رواه مسلم (2564)‏.‏