allah has indeed bestowed a great favour upon the muslims in that he sent to them a noble messenger from among them who recites to them his verses and purifies them and teaches them the book and wisdom and before it they were definitely in open error. 
لقد من الله على المؤمنين إذ بعث فيهم رسولا من أنفسهم يتلو عليهم آياته ويزكيهم ويعلمهم الكتاب والحكمة وإن كانوا من قبل لفي ضلال مبين