(2:150) At whatever place you may be, you must turn your face towards the Masjid Haram, and wherever you may be, you must turn your face towards the same at prayer so that people might not find an argument against you. *150 As for the unjust people, they will never stop talking; so do not fear them but fear Me -- (Do this) so that I may complete My favour *151 upon you and you may find the way to real success, *152

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*150). The followers of the Prophet (peace be upon him) were asked to follow the order to turn towards the Ka'bah, and to do so strictly, since any lapse in this matter on their part would give their opponents a weapon to use against them in their polemics. They would be able to hold Muslims up to ridicule on the grounds that they had voilated what they themselves claimed to be from their Lord.
*151). The 'favour' here refers to the position of world leadership and guidance from which God removed the children of israel and which was the conferred upon this ummah. The highest reward that can be granted to a people in recognition of its righteousness is its designation, by God's command, to the leadership of the world in order to guide the entire human race to godliness and righteousness.
What is said here, therefore, is that the command to change the qiblah was a sign of installation of the Muslims to leadership. Hence, the Muslims should follow the directives of God if for no other reason than that ingratitude and disobedience might deprive them of the honour that had been bestowed upon them.
*152). '...Perhaps you will be guided to the right way' is indicative here of the regal appropriate for God's address to His creatures. The indication from a soverign, while addressing his slave, that the latter could expect some favour from him is quite enough to make that slave rejoice and celebrate.