Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “Do not envy each other, do not outbid each other, do not hate each other, do not turn away from each other, and do not outsell each other. Rather, be servants of Allah as brothers. The Muslim is the brother of another Muslim. He does not wrong him or humiliate him or look down upon him. Righteousness is here,” and the Prophet pointed to his chest three times. “It is sufficient evil for a person to look down upon his brother Muslim. All of the Muslim is sacred to another Muslim: his life, his wealth, and his honor.”

Source: Sahih Muslim 2564

Grade: Sahih (authentic) according to Muslim

عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا تَحَاسَدُوا وَلَا تَنَاجَشُوا وَلَا تَبَاغَضُوا وَلَا تَدَابَرُوا وَلَا يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَكُونُوا عِبَادَ اللَّهِ إِخْوَانًا الْمُسْلِمُ أَخُو الْمُسْلِمِ لَا يَظْلِمُهُ وَلَا يَخْذُلُهُ وَلَا يَحْقِرُهُ التَّقْوَى هَاهُنَا وَيُشِيرُ إِلَى صَدْرِهِ ثَلَاثَ مَرَّاتٍ بِحَسْبِ امْرِئٍ مِنْ الشَّرِّ أَنْ يَحْقِرَ أَخَاهُ الْمُسْلِمَ كُلُّ الْمُسْلِمِ عَلَى الْمُسْلِمِ حَرَامٌ دَمُهُ وَمَالُهُ وَعِرْضُهُ

صحيح مسلم كِتَاب الْبِرِّ وَالصِّلَةِ وَالْآدَابِ بَاب تَحْرِيمِ ظُلْمِ الْمُسْلِمِ وَخَذْلِهِ وَاحْتِقَارِهِ وَدَمِهِ وَعِرْضِهِ وَمَالِهِ 2564

http://dailyhadith.abuaminaelias.com/2011/10/07/taqwa-mindfulness-of-allah-is-in-the-heart-it-protects-the-believer-from-envy-hatred-and-discord/