Sahih Muslim Book 4, Hadith Number 1072.

Chapter : Building of the Prophet’s Mosque in Medina.

Abu Ishaq reported: I heard al-Bara’ saying: We prayed with the Messenger of Allah (may peace be upon him) (with our faces) towards Bait-ul-Maqdis for sixteen months or seventeen months. Then we were made to change (our direction) towards the Ka’ba.