It was narrated that Nafi' bin 'Abdul-Harith met 'Umar bin Khattab in 'Usfan, when 'Umar had appointed him as his governer in Makkah.:
'Umar asked: Whom have you appointed as your deputy over the people of the valley? He said: I have appointed Ibn Abza over them. 'Umar said: Who is Ibn Abza? Nafi' said: One of our freed slaves. 'Umar said: Have you appointed a freed slave over them? Nafi' said: He has great knowledge of the Book of Allah, is well versed in the rules of inheritance (Fara'id) and is a (good) judge. 'Umar said: Did not your prophet say: 'Allah raises some people (in status) because of this book and brings others low because of it?'