Sahih Muslim Book 20, Hadith Number 4721.

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 ‘Abd al-Rahman b. Shamasa al-Mahri who said: I was in the company of Maslama b. Mukhallad, and ‘Abdullah b. ‘Amr b. ‘As was with him. ‘Abdullah said: The Hour shall some only when the worst type of people are left on the earth. They will be worse than the people of pre-Islamic days. They will get whatever they ask of Allah. While we were yet sitting when ‘Uqba b. ‘Amir came, and Maslama said to him: ‘Uqba, listen to what ‘Abdullah says. ‘Uqba said: He knows better; so far as I am concerned, I heard the Messenger of Allah (may peace be upon him) say: A group of people from my Umma will continue to fight in obedience to the Command of Allah, remaining dominant over their enemies. Those who will oppose them shall not do them any harm. They will remain ill this condition until the Hour overtakes them. (At this) ‘Abdullah said: Yes. Then Allah will raise a wind which will be fragrant like musk and whose touch will be like the touch of silk ; (but) it will cause the death of all (faithful) persons, not leaving behind a single person with an iota of faith in his heart. Then only the worst of men will remain to be overwhelmed by the Hour.