عَنْ عَبْدِ الرَّحْمَنِ بْنِ صَحَّارٍ الْعَبْدِيِّ عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ”لَا تَقُومُ السَّاعَةُ حَتَّى يُخْسَفَ بِقَبَائِلَ، فَيُقَالُ: مَنْ بَقِيَ مِنْ بَنِي فُلَانٍ“، قَالَ: فَعَرَفْتُ حِينَ قَالَ قَبَائِلَ أَنَّهَا الْعَرَبُ، لِأَنَّ الْعَجَمَ تُنْسَبُ إِلَى قُرَاهَا
It is narrated from Sayyiduna Sahar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The Hour will not be established until several tribes are swallowed up by the earth. (When a tribe is swallowed up,) it will be asked: Who among the such-and-such tribe has survived? Sayyiduna Sahar (may Allah be pleased with him) says: When the Prophet (peace and blessings be upon him) mentioned tribes, I understood that these would be Arab people, because non-Arabs are referred to by the names of their towns.