And do not believe but in him who follows your religion. Say: Surely the (true) guidance is the guidance of Allah-- that one may be given (by Him) the like of what you were given; or they would contend with you by an argument before your Lord. Say: Surely grace is in the hand of Allah, He gives it to whom He pleases; and Allah is Ample-giving, Knowing.

So that the followers of the Book may know that they do not control aught of the grace of Allah, and that grace is in Allah's hand, He gives it to whom He pleases; and Allah is the Lord of mighty grace.