Imam Sha'bi, may Allah have mercy on him, says that a companion, may Allah be pleased with him, who passed by an isolated grave with the Prophet, peace and blessings be upon him, told me that the Prophet, peace and blessings be upon him, offered its funeral prayer and the people lined up behind the Prophet, peace and blessings be upon him. I asked Imam Sha'bi, may Allah have mercy on him, the name of this companion, so he told me: Sayyiduna Ibn Abbas, may Allah be pleased with them both.