Muhammad bin Umar narrates from his teachers that the name of Sayyiduna Abu Dujanah (may Allah be pleased with him) was Simak bin Kharashah. The Messenger of Allah (peace and blessings be upon him) established brotherhood between him and Sayyiduna Utbah bin Ghazwan (may Allah be pleased with him). Abu Dujanah (may Allah be pleased with him) took part in the battles of Badr and Uhud, stood firm with the Messenger of Allah (peace and blessings be upon him) on the day of Uhud, and pledged allegiance to him unto death. He also took part in the Battle of Yamamah and was among those who had a share in sending Musaylimah the Liar to Hell. Sayyiduna Abu Dujanah (may Allah be pleased with him) was martyred on that same day.