Why did people disapprove when the Prophet Muhammad (saw) changed his direction for prayer from Jerusalem to the Ka'ba (Mecca)?
      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). The first      prayer which he offered facing the Ka'ba was the 'Asr prayer in the      company of some people. Then one of those who had offered that prayer      with him came out and passed by some people in a mosque who were      bowing during their prayers (facing Jerusalem). He said addressing      them, "By Allah, I testify that I have prayed with Allah's Apostle      facing Mecca (Ka'ba).' Hearing that, those people changed their      direction towards the Ka'ba immediately. Jews and the people of the      scriptures used to be pleased to see the Prophet facing Jerusalem in      prayers but when he changed his direction towards the Ka'ba, during      the prayers, they disapproved of it.     Al-Bara' added, "Before we changed our direction towards the Ka'ba      (Mecca) in prayers, some Muslims had died or had been killed and we      did not know what to say about them (regarding their prayers.) Allah      then revealed: And Allah would never make your faith (prayers) to be      lost (i.e. the prayers of those Muslims were valid).' " (2:143).