Sahih Muslim Book 1, Hadith Number 270.

Chapter : Islam was initiated as something strange, and it would revert to its (old position) of being strange, and it would concentrate between the two mosques.

It is narrated on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) said: Islam initiated as something strange, and it would revert to its (old position) of being strange, so good tidings for the stranger.