He was born in al-Fayyūm, Egypt. When he was 28, he left Egypt and his wife and two sons, and traveled to Babylonia. There, he helped schools in many Jewish communities. After a while, he left Babylonia because he was not happy with the government.
As a religious scholar, he translated the Bible into Arabic and wrote many commentaries on it. He also wrote the first Hebrew dictionary and grammar dictionary, and many books on Talmudic law. One of his famous books is called Kitāb al-amānāt wa al-iʿtiqādāt ("Book of Beliefs and Convictions").
- Arabic: سعيد بن يوسف الفيومي; Hebrew: רבי סעדיה בן יוסף אלפיומי גאון. Other names for him in English are: Saadia ben Joseph or Saadia ben Joseph of Faym and Saadia ben Joseph Al-Fayyumi.
- Sa'adia ben Joseph" Merriam Webster's Biographical Dictionary galegroup.com Biography in Context Web. 4 December 2013. Zucker, Moses. “Sa’adia ben Joseph” Encyclopedia Britannica. web. 4 December. 2013.