Abi Dhar Mosque, may Allah be pleased with him:

Abi Dhar Mosque is located on the western side of Rabatha, it is the mosque that Abi Dhar himself planned it when the Rabatha came down in the caliphate of Othman bin Affan, may Allah be pleased with him, It is 22.75 x 20.15 meters long and has a prominent mihrab in the middle of the Qibla wall, The mosque was a place where scholars and speakers met since the era of the mosque’s founder, Abu Dhar, may Allah be pleased with him.

Reference: Preservations of Medina, Abdullah bin Mustafa Al-Shanqeeti, 1434 AH