It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him and his family) commanded us to build the mosque. We were carrying one brick each, while Sayyiduna Ammar (may Allah be pleased with him) was carrying two bricks at a time, due to which his head became covered with dust. Sayyiduna Abu Sa'id (may Allah be pleased with him) says that I did not hear this myself from the Messenger of Allah (peace and blessings be upon him and his family), but my companions informed me that the Messenger of Allah (peace and blessings be upon him and his family) was dusting the dirt off Sayyiduna Ammar's (may Allah be pleased with him) head and at the same time was saying: "Son of Sumayyah! May Allah have mercy on you, a rebellious group will kill you."