The Cow - 2:143
So We made you a clear-minded people so that you may be witnesses among the people and the Messenger may be a witness among you. And We changed the Qiblah, which you used to turn towards, to distinguish between those who follow the Messenger and those who turn back on their heels. Surely this is too much for anyone except those whom Allah guides. Allah will not make your faith vain. Allah is Compassionate to mankind, Most Merciful.
What is Qibla?
The Cow/2:125
"We have made the Ka´bah a focal point for the people and a place of safety. Use the seat of Abraham as a place of prayer. "We commissioned Abraham and Ishmael to keep My House clean for the visitors and those who devote themselves to worship and those who bow down and prostrate themselves."