Thus We appointed you a midmost nation that you might be witnesses to the people, and that the Messenger might be a witness to you; and We did not appoint the direction thou wast facing, except that We might know who followed the Messenger from him who turned on his heels -- though it were a grave thing save for those whom God has guided; but God would never leave your faith to waste - truly, God is All-gentle with the people, All-compassionate.