The Messenger of Allah ﷺ said: Some of my people will alight on low-lying ground, which they will call al-Basrah, beside a river called the Tigris over which there is a bridge. Its people will be numerous and it will be one of the capital cities of immigrants (or one of the capital cities of Muslims, according to the version of Ibn Yahya who reported from Abu Ma'mar). At the end of time the descendants of Qantura' will come with broad faces and small eyes and alight on the bank of the river. The town's inhabitants will then separate into three sections, one of which will follow cattle and (live in) the desert and perish, another of which will seek security for themselves and perish, but a third will put their children behind their backs and fight the invaders, and they will be the martyrs.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ يَنْزِلُ نَاسٌ مِنْ أُمَّتِي بِغَائِطٍ يُسَمُّونَهُ الْبَصْرَةَ عِنْدَ نَهْرٍ يُقَالُ لَهُ دِجْلَةُ يَكُونُ عَلَيْهِ جِسْرٌ يَكْثُرُ أَهْلُهَا وَتَكُونُ مِنْ أَمْصَارِ الْمُهَاجِرِينَ قَالَ ابْنُ يَحْيَى قَالَ أَبُو مَعْمَرٍ وَتَكُونُ مِنْ أَمْصَارِ الْمُسْلِمِينَ فَإِذَا كَانَ فِي آخِرِ الزَّمَانِ جَاءَ بَنُو قَنْطُورَاءَ عِرَاضُ الْوُجُوهِ صِغَارُ الأَعْيُنِ حَتَّى يَنْزِلُوا عَلَى شَطِّ النَّهْرِ فَيَتَفَرَّقُ أَهْلُهَا ثَلاَثَ فِرَقٍ فِرْقَةٌ يَأْخُذُونَ أَذْنَابَ الْبَقَرِ وَالْبَرِّيَّةِ وَهَلَكُوا وَفِرْقَةٌ يَأْخُذُونَ لأَنْفُسِهِمْ وَكَفَرُوا وَفِرْقَةٌ يَجْعَلُونَ ذَرَارِيَّهُمْ خَلْفَ ظُهُورِهِمْ وَيُقَاتِلُونَهُمْ وَهُمُ الشُّهَدَاءُ  

The Prophet ﷺ said: The people will establish cities, Anas, and one of them will be called al-Basrah or al-Busayrah. If you should pass by it or enter it, avoid its salt-marshes, its Kall, its market, and the gate of its commanders, and keep to its environs, for the earth will swallow some people up, pelting rain will fall and earthquakes will take place in it, and there will be people who will spend the night in it and become apes and swine in the morning.  

حَدَّثَنَا مُوسَى الْحَنَّاطُ لاَ أَعْلَمُهُ إِلاَّ ذَكَرَهُ عَنْ مُوسَى بْنِ أَنَسٍ عَنْ أَنَسِ بْنِ مَالِكٍ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لَهُ يَا أَنَسُ إِنَّ النَّاسَ يُمَصِّرُونَ أَمْصَارًا وَإِنَّ مِصْرًا مِنْهَا يُقَالُ لَهُ الْبَصْرَةُ أَوِ الْبُصَيْرَةُ فَإِنْ أَنْتَ مَرَرْتَ بِهَا أَوْ دَخَلْتَهَا فَإِيَّاكَ وَسِبَاخَهَا وَكِلاَءَهَا وَسُوقَهَا وَبَابَ أُمَرَائِهَا وَعَلَيْكَ بِضَوَاحِيهَا فَإِنَّهُ يَكُونُ بِهَا خَسْفٌ وَقَذْفٌ وَرَجْفٌ وَقَوْمٌ يَبِيتُونَ يُصْبِحُونَ قِرَدَةً وَخَنَازِيرَ  

We went on the pilgrimage and met a man who asked us: Is there a town near you called al-Ubullah? We said: Yes. He said: Is there any of you who will undertake to pray two or four rak'ahs on my behalf in the mosque of al-Ashshar, stating "they are on behalf of AbuHurayrah"? He (Abu Hurayrah) said: I heard my friend AbulQasim ﷺ say: On the Day of Resurrection Allah will raise martyrs from the mosque of al-Ashshar, who will be the only ones to rise with the martyrs of Badr. Abu Dawud said: This mosque is near the river.  

سَمِعْتُ أَبِي يَقُولُ انْطَلَقْنَا حَاجِّينَ فَإِذَا رَجُلٌ فَقَالَ لَنَا إِلَى جَنْبِكُمْ قَرْيَةٌ يُقَالُ لَهَا الأُبُلَّةُ قُلْنَا نَعَمْ قَالَ مَنْ يَضْمَنُ لِي مِنْكُمْ أَنْ يُصَلِّيَ لِي فِي مَسْجِدِ الْعَشَّارِ رَكْعَتَيْنِ أَوْ أَرْبَعًا وَيَقُولَ هَذِهِ لأَبِي هُرَيْرَةَ سَمِعْتُ خَلِيلِي أَبَا الْقَاسِمِ ﷺ يَقُولُ إِنَّ اللَّهَ يَبْعَثُ مِنْ مَسْجِدِ الْعَشَّارِ يَوْمَ الْقِيَامَةِ شُهَدَاءَ لاَ يَقُومُ مَعَ شُهَدَاءِ بَدْرٍ غَيْرُهُمْ