What is Bible ?
Bible is (noun) 1. a Christian and Jewish book of scriptures He reads from the Bible every evening. 2. an important and useful reference book She keeps an old French cookery book in the kitchen it’s her bible. COMMENT: The Christian Bible is made up of the Old Testament (the Jewish scriptures) and the New Testament, which are the writings concerned with the life and works of Christ and the early Christian Church.
source: Easier English, Student Dictionary Upper Intermediate Level