Muhammad bin Ammarah says that my grandfather, Hazrat Khuzaimah (may Allah be pleased with him), kept his sword sheathed on the day of the Battle of Jamal, but in the Battle of Siffin, in which Hazrat Ammar (may Allah be pleased with him) was martyred, he drew his sword from its sheath and fought so much that he was eventually martyred. He used to say that I heard the Holy Prophet (peace and blessings be upon him) say: "A rebellious group will kill Ammar."