Sahih Muslim Book 001, Hadith Number 0031.

Chapter : Command for fighting against the people so long as they do not profess that there is no god but Allah and Muhammad is His Messenger.

It is reported on the authority of Abu Huraira that he heard the Messenger of Allah say: I have been commanded to fight against people, till they testify to the fact that there is no god but Allah, and believe in me (that) I am the messenger (from the Lord) and in all that I have brought. And when they do it, their blood and riches are guaranteed protection on my behalf except where it is justified by law, and their affairs rest with Allah.

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