عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: «المُسْلِمُ مَنْ سَلِمَ المُسْلِمُونَ مِنْ لِسَانِهِ وَيَدِهِ، وَالمُهَاجِرُ مَنْ هَجَرَ مَا نَهَى اللَّهُ عَنْهُ».
The Prophet (may Allah's peace and blessings be upon him) informed that a true and perfect Muslim is the one from whose tongue Muslims are safe, so he does not insult, curse, or backbite them and does not hurt them with his tongue in any way. They are also safe from his hand, as he does not assault them or take their properties wrongfully, or the like. As for the emigrant, he is the one who abandons what Allah Almighty has prohibited.
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