It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that once a funeral procession passed by Marwan, but he did not stand up. Hazrat Abu Saeed (may Allah be pleased with him) said that a funeral had passed by the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) stood up. Upon this, Marwan also had to stand up.