Battle of Siffin
According to Tabari, the ten bits of "advice" that Abu Bakr gave was during the Expedition of Usama bin Zayd. During the Battle of Siffin, the Caliph Ali stated that Islam does not permit Muslims to stop the supply of water to their enemy. In addition to the Rashidun Caliphs, hadiths attributed to Muhammad himself suggest that he stated the following regarding the Muslim conquest of Egypt that eventually took place after his death: