Nafi bin Abdul-Harith met Umar at Usfan. Umar had appointed him as governor over Mecca, so he asked, "Whom have you appointed over the people of the valley?"Nafi replied, "Ibn Abza."Umar asked, "And who is Ibn Abza?"He said, "One of our freed slaves."Umar said, "You appointed a freed slave over them?"He replied, "He is a reciter of the Book of Allah , and he is knowledgeable in the laws of inheritance."Umar said, "Indeed, your Prophet ﷺ has said, 'Allah raises some people by this Book and lowers others by it.'"
أن نافع بن عبد الحارث لقي عمر بعسفان، وكان عمر يستعمله على مكة، فقال: من استعملت على أهل الوادي؟ فقال: ابن أبزى. قال: ومن ابن أبزى؟ قال: مولى من موالينا. قال: فاستخلفت عليهم مولى؟ قال: إنه قارئ لكتاب الله عز وجل، وإنه عالم بالفرائض. قال عمر: أما إن نبيكم ﷺ قد قال: إن الله يرفع بهذا الكتاب أقواما ويضع به آخرين.
Muslim narrated it in Prayer of Travelers (816:269), from Zuhayr bin Harb, who said, Yaqub bin Ibrahim narrated to us, who said, my father narrated to me, from Ibn Shihab, from Amir bin Wathila, and he related it.