Sahih Muslim Book 20, Hadith Number 4717.

Chapter : Saying of the Holy Prophet (may peace be upon him): “A group of people from my Umma will always remain on the right path and continue to be triumphant.’ their opponents shall not be able to do them any harm.

It has been narrated on the authority of Jabir b. Samura that the Holy Prophet (may peace be upon him) said: This religion will continue to exist, and a group of people from the Muslims will continue to fight for its protection until the Hour is established.