Sahih Bukhari, Chapter: Belief

Allah's Messenger said: "I have been ordered (by Allah) to fight against the people until they testify that none has the right to be worshipped but Allah and that Muhammad is Messenger of Allah, and perform as-salat [perform as-salat (prayers)] and give zakat (obligatory charity) so if they perform all that, then they save their lives and properties from me except for Islamic laws, and their reckoning (accounts) will be with (done by) Allah."