Why? Jesus said: “By this all will know that you are my disciples, if you have love among yourselves. ”
قَالَ يَسُوعُ :‏ « بِهٰذَا يَعْرِفُ ٱلْجَمِيعُ أَنَّكُمْ تَلَامِيذِي ،‏ إِنْ كَانَ لَكُمْ مَحَبَّةٌ بَعْضًا لِبَعْضٍ » .‏