Hadis

On the authority of Tamim Al-Dari that the prophet said: "Religion is sincerity". We said: "To whom?" He said: "To Allah and His Book, and His messenger, and to the leaders of the Muslims and their common folk".
Narrated by Muslim


Abdullah bin Omar narrated that the messenger of Allah said: "I have been ordered to fight against people until they testify that there is no god but Allah and that Muhammed is the messenger of Allah and until they perform the prayers and pay the zakat, and if they do so they will have gained protection from me for their lives and property, unless [they do acts that are punishable] in accordance with Islam, and their reckoning will be with Allah the Almighty."
Related by Bukhari and Muslim.