He (Abu Hurayrah) said: I heard my friend Abu lQasim (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.
In-book : Book 39, Hadith 18
English translation : Book 38, Hadith 4294