The Qiblah is mentioned in the Quran in these verses:
[2:142] The fools among the people would say, “Why did they change the direction of their Qiblah?” Say, “To God belongs the east and the west; He guides whoever wills in a straight path.”
[2:143] We thus made you an impartial community, that you may serve as witnesses among the people, and the messenger serves as a witness among you. We changed the direction of your original Qiblah only to distinguish those among you who readily follow the messenger from those who would turn back on their heels. It was a difficult test, but not for those who are guided by God. God never puts your worship to waste. God is Compassionate towards the people, Most Merciful.
[2:144] We have seen you turning your face about the sky (searching for the right direction). We now assign a Qiblah that is pleasing to you. Henceforth, you shall turn your face towards the Sacred Masjid. Wherever you may be, all of you shall turn your faces towards it. Those who received the previous scripture know that this is the truth from their Lord. God is never unaware of anything they do.
[2:145] Even if you show the followers of the scripture every kind of miracle, they will not follow your Qiblah. Nor shall you follow their Qiblah. They do not even follow each others’ Qiblah. If you acquiesce to their wishes, after the knowledge that has come to you, you will belong with the transgressors.
[2:146] Those who received the scripture recognize the truth herein, as they recognize their own children. Yet, some of them conceal the truth, knowingly.
[2:147] This is the truth from your Lord; do not harbor any doubt.
[2:148] Each of you chooses the direction to follow; you shall race towards righteousness. Wherever you may be, God will summon you all. God is Omnipotent.
[2:149] Wherever you go, you shall turn your face (during Salat) towards the Sacred Masjid. This is the truth from your Lord. God is never unaware of anything you all do.
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