An-Nawawi Hadith - 35

لاَ تَحَاسَدُوا، وَلاَ تَنَاجَشُوا، وَلاَ تَبَاغَضُوا، وَلاَ تَدَابَرُوا، وَلاَ يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ، وَكُونُوا عِبَادَ اللهِ إِخْوَاناً، الْمُسْلِمُ أَخُو الْمُسْلِمِ: لاَ يَظْلِمُهُ، وَلاَ يَخْذُلُهُ، وَلاَ يَكْذِبُهُ، وَلاَ يَحْقِرُهُ، التَّقْوَى ههُنَا ـ وَيُشِيرُ إِلَى صَدْرِهِ ثَلاَثَ مَرَّاتٍ ـ بِحَسْبِ امْرِئٍ مِنَ الشَّرِّ أَنْ يَحْقِرَ أَخَاهُ الْمُسْلِمَ، كُلُّ الْمُسْلِمِ عَلَى الْمُسْلِمِ حَرَامٌ: دَمُهُ، وَمَالُهُ، وَعِرْضُهُ حَدِيثٌ حَسَنٌ رَوَاهُ الدَّارَقُطْنِي وَغَيْرُهُ

Abu Hurairah, radiyallahu 'anhu, reported that the Messenger of Allah, sallallahu 'alayhi wasallam, said: "Do not be envious of one another; do not artificially inflate prices against one another; do not hate one another; do not shun one another; and do not undercut one another in business transactions; 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. Piety is here - and he pointed to his chest three times. It is evil enough for a Muslim to hold his brother Muslim in contempt. All things of a Muslim are inviolable for another Muslim: his blood, his property and his honour." [Muslim]