Sahih Muslim Book 20, Hadith Number 4722.

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 by Sa’d b. Abu Waqqas that the Messenger of Allah (may peace be upon him) said: The people of the West will continue to triumphantly follow the truth until the Hour is established.