Narrated `Abdullah bin `Umar: While the people were offering the Fajr prayer at Quba' (near Medina), someone came to them and said: It has been revealed to Allah's Apostle tonight, and he has been ordered to pray facing the Ka`ba. So turn your faces to the Ka`ba. Those people were facing Sham (Jerusalem) so they turned their faces towards Ka`ba (at Mecca).