Narrated Al-Bara' (bin 'Azib):
When the Prophet came to Medina, he stayed first with his grandfathers or maternal uncles from Ansar. He offered his prayers facing Baitul-Maqdis (Jerusalem) for sixteen or seventeen months, but he wished that he could pray facing the Ka'ba (at Mecca)........................
BUKHARI (Book #2, Hadith #39)