(17) CHAPTER. “Those to whom We gave the Scripture recognise him as they recognise their sons... (V.2:146).
Narrated Ibn `Umar: While some people were offering Fajr prayer at Quba' (mosque), some-one came to them and said, Tonight some Qur'anic Verses have been revealed to the Prophet and he has been ordered to face the Ka`ba (at Mecca) (during prayers), so you too should turn your faces towards it. At that time their faces were towards Sham (Jerusalem) so they turned towards the Ka`ba (at Mecca).