Quoting from the sources, Muhammad Munir, from the Department of Law of the International Islamic University, Pakistan, says that early religious authorities standing against the execution of POWs "at all" include 'Ali b. Abi Tãlib, Al-Hasan b. al-Hasan al-Basrl (d. 110/728), Hammãd b. Abi Sulaymän (d. 120/737), Muhammad b. Sirin (d. 110/728), Mujãhid b. Jabr (d. 103/721), 'Abd al-Mãlik b. 'Abd al-'Azïz b. Jurayj (d. 150/767), 'Atâ' b. Abi Rabãh (d. 114/732) and Abû 'Ubayd ibn Sallãm, while later scholars favouring the same opinion include Muhammad b. Ahmad al-Qurtubl (d. 671/1272), who shares to vindicate the sheer impossibility of execution if we follow the letter of the Qur'an. Ibn Rushd (d. 594/1198) is also quoted: " number of jurists did not permit executing the prisoners of war. Al-Hasan b. Muhammad al-Tamïmï (d. 656/1258) stated consensus (ijma) of the Companions on this view." He further shows that the rare executions were more due to the crimes they committed before the captivity than their status of POW itself. A famous case being 'Abd Allah b. Khatal. One of the few persons who weren't granted immunity at the conquest of Mecca. A group of people which "could have been punished by a tribunal should there have been one at the time”. But he was the only one executed for what we would today call high treason (as he collected tax money from Muslims before defecting and fighting them). More generically, he also shows that "in the first one hundred years of Islamic military history, that is, from the time of the Prophet (peace be upon him) till the time of Caliph 'Umar b. 'Abdul 'Aziz, there were only six or seven such cases, even if we were to accept the spurious reports of such executions."