'I asked Abu 'Abdullah [al-Sadiq] (AS) about two groups of believers; one group were rebels and the other group just, and the just group defeated the rebels.' He (AS) said, 'The just group does not have the right to chase the retrieving fugitive or to kill a prisoner or finish off a wounded person, and this is of course when nobody from the rebels are left and no formation from them exists to return so that those who have remained may join them.'