A Muslim protects his fellow Muslims from harm

The Prophet ﷺ said, "A Muslim is the one who avoids harming Muslims with his tongue and hands. And a muhajir (emigrant) is the one who abandons all what Allah has forbidden."

عَنِ النَّبِيِّ ﷺ قَالَ: «الْمُسْلِمُ مَنْ سَلِمَ الْمُسْلِمُونَ مِنْ لِسَانِهِ وَيَدِهِ، وَالْمُهَاجِرُ مَنْ هَجَرَ مَا نَهَى اللَّهُ عَنْهُ».