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Ahmed Raza Khan: Mohammed Aqib Qadri:
And so it is that We have made you the best nation* for you are witnesses** against mankind, and the Noble Messenger is your guardian and your witness; and (O dear Prophet Mohammed - peace and blessings be upon him) We had appointed the qiblah which you formerly observed only to see (test) who follows the Noble Messenger, and who turns away; and it was indeed hard except for those whom Allah guided; and it does not befit Allah's Majesty to waste your faith! Indeed Allah is Most Compassionate, Most Merciful towards mankind. (The best Ummah is that of Prophet Mohammed - peace and blessings be upon him. **The Holy Prophet is a witness from Allah.)

Yusuf Ali:
Thus, have We made of you an Ummat justly balanced, that ye might be witnesses over the nations, and the Messenger a witness over yourselves; and We appointed the Qibla to which thou wast used, only to test those who followed the Messenger from those who would turn on their heels (From the Faith). Indeed it was (A change) momentous, except to those guided by Allah. And never would Allah Make your faith of no effect. For Allah is to all people Most surely full of kindness, Most Merciful.

Pickthal:
Thus We have appointed you a middle nation, that ye may be witnesses against mankind, and that the messenger may be a witness against you. And We appointed the qiblah which ye formerly observed only that We might know him who followeth the messenger, from him who turneth on his heels. In truth it was a hard (test) save for those whom Allah guided. But it was not Allah's purpose that your faith should be in vain, for Allah is Full of Pity, Merciful toward mankind.