عَنْ عَبْدِ اللَّهِ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ سِبَابُ الْمُسْلِمِ أَخَاهُ فُسُوقٌ وَقِتَالُهُ كُفْرٌ وَحُرْمَةُ مَالِهِ كَحُرْمَةِ دَمِهِ
Narrated by Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: To abuse a Muslim is wickedness, and to fight him is disbelief, and the sanctity of a Muslim's wealth is like the sanctity of his blood.