Ammar ibn Yasir
When Ammar 'died, Muʿāwiya referred to him as "one of ʿAlī's two right hands" with the other being Malik al-Ashtar. Madelung quotes Al-Tabari by reporting what Muʿāwiya said to his followers after killing Imam Ali's other loyal companion, Malik al-Ashtar: "Ali b. Abi Talib had two right hands. One of them was cut at Siffin', meaning ʻAmmār b. Yasir, 'and the other today', meaning al-Ashtar". Despite Muʿāwiya's provocations, ʻAli ibn Abi Talib, the Caliph at the time, highly valued the support of 'Ammar ibn Yasir and Malik al-Ashtar nonetheless. ʻAli mourned 'Ammar's loss deeply.