The Duty of Muslims When Two Muslim Groups are Fighting
Issue No. 1562- If a group of Muslims invade another group, they should prevent the invading group from aggression until they submit to Allah’s command. In case, Muslims acquire any booties, they cannot treat them as their own properties, rather, they should keep them and return them in due time, except for those things which, if returned, will be a cause for corruption and continuation of aggression, then in such a case, they should be used in a proper way with the permission of the Mujtahid or his representative.
