Al-Baqarah · 2:150

150. Wherever you come from, O Prophet, when you want to pray, turn towards the direction of the Sacred Mosque; and wherever you may be, O believers, turn your face towards it if you want to pray, so that the people will have no argument against you, except those of them who are wrongdoers. They will remain in their stubbornness, arguing against you with the weakest of arguments. Do not fear them, but fear your Lord alone, following His instructions and keeping away from what He has prohibited. Allah instructed you to face the Kaaba to perfect His blessings upon you, distinguishing you from all other communities and guiding you to the noblest direction of prayer.