O mankind! do your duty to your Lord, and fear (the coming of) a Day when no father can avail aught for his son, nor a son avail aught for his father. Verily, the promise of Allah is true: let not then this present life deceive you, nor let the chief deceiver deceive you about Allah.[Qur'an 31-33]
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.