حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنِي إِبْرَاهِيمُ بْنُ صَالِحِ بْنِ دِرْهَمٍ، قَالَ 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 صلى الله عليه وسلم يَقُولُ ‏"‏ إِنَّ اللَّهَ يَبْعَثُ مِنْ مَسْجِدِ الْعَشَّارِ يَوْمَ الْقِيَامَةِ شُهَدَاءَ لاَ يَقُومُ مَعَ شُهَدَاءِ بَدْرٍ غَيْرُهُمْ ‏"‏ ‏.‏ قَالَ أَبُو دَاوُدَ هَذَا الْمَسْجِدُ مِمَّا يَلِي النَّهْرَ ‏.‏

Salih ibn Dirham said: 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 (PBUH) 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. Translation Not Available

Book reference: Sunan Abi Dawud Book 39 Hadith 4308
Web reference: Sunan Abi Dawud Book 38 Hadith 4294