Sahih Bukhari Volume 001, Book 002, Hadith Number 024.

Narated By Ibn 'Umar : Allah's Apostle said: "I have been ordered (by Allah) to fight against the people until they testify that none has the right to be worshiped but Allah and that Muhammad is Allah's Apostle, and offer the prayers perfectly and give the obligatory charity, so if they perform a that, then they save their lives an property from me except for Islamic laws and then their reckoning (accounts) will be done by Allah."