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 Abu Hurairah"? He (Abu Hurairah) said: I heard my friend Abul Qasim 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.
Hadith Referenceسنن ابي داود / كتاب الملاحم / 4308
Hadith Gradingالألبانی:ضعيف | زبیر علی زئی:ضعيف, إسناده ضعيف, إبراهيم بن صالح ضعفه الدار قطني والجمهور وقال الحافظ ابن حجر : فيه ضعف (تق: 186), انوار الصحيفه، صفحه نمبر 153