عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ قَالَ كَسَعَ رَجُلٌ مِنَ الْمُهَاجِرِينَ رَجُلًا مِنَ الْأَنْصَارِ فَقَالَ الْأَنْصَارِيُّ يَا لَلْأَنْصَارِ وَقَالَ الْمُهَاجِرِيُّ يَا لَلْمُهَاجِرِينَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ ((أَلَا مَا بَالُ دَعْوَى الْجَاهِلِيَّةِ دَعُوا الْكَسْعَةَ فَإِنَّهَا مُنْتِنَةٌ))
Sayyiduna Jabir (may Allah be pleased with him) narrates that a Muhajir man struck an Ansari man on his back with his hand or foot (and because of this a fight broke out). The Ansari called out: "O Ansar!" The Muhajir called out: "O Muhajir!" Upon hearing this, the Messenger of Allah (peace and blessings be upon him) said: Beware! What is the reason for calling out with the call of ignorance? Leave such mischiefs; they are blameworthy.