Mukhtasar Bukhari

Narrated Abdullah bin Umar (may Allah be pleased with them): The Prophet (peace and blessings of Allah be upon him) also offered prayer at the edge of that mound which is behind (the place) ‘Arj, when you are going towards (the village of) Hazbah. Near this mosque, there are two or three graves, and stones are placed on the graves. (There, the Prophet, peace be upon him, offered prayer on the right side of the road, near the stones of the road, between those very stones.) After the sun had passed its zenith at noon, Abdullah (may Allah be pleased with him) would depart from the place of ‘Arj and offer the Zuhr prayer in this mosque (meaning that a mosque had been built between those stones).