What did the Prophet Muhammad (peace be upon him) say about people being exalted or degraded by the Book of Allah, the Exalted and Great?
 'Amir b. Wathila reported that Nafi' b. 'Abd al-Harith met 'Umar at 'Usfan and 'Umar had employed him as collector in Mecca. He (Hadrat 'Umar) said to him (Nafi'):                      Whom have you appointed as collector over the people of the valley? He said: Ibn Abza. He said: Who is Ibn Abza? He said: He is one of our freed slaves. He (Hadrat 'Umar) said: So you have appointed a freed slave over them. He said: He is well versed In the Book of Allah. the Exalted and Great, and he is well versed In the commandments and injunctions (of the Shari'ah). 'Umar said: So the Holy Prophet (may peace be upon him) said: By this Book, Allah would exalt some peoples and degrade others.