''There is no compulsion in religion''

Muslims were prohibited from taking anything from the general public of a conquered country without paying for it. When the Muslim army occupied an area of the enemy country, it did not have the right to use things belonging to the people without consent.

''The Prophet has prohibited the believers from looting and plunder (Bukhari)

''Do not destroy villages and towns, do not spoil the cultivated fields and gardens, and do not slaughter the cattle.''

''Do not kill any old person, any child or any women'' (AbuDawud)

''Do not kill the monks in monasteries'' and '' do not kill the people who are sitting in places of worship.'' (Ibn Hanbal)

''Do not attack a wounded person.''

''No prisoner should be put to the sword.''

''The greatest sins are to associate something with God and to kill human beings.''
(The above Hadith's are from the most quoted collections of Bukhari and Muslim.)