Bible

the collection of sacred writings of the Christian religion, comprising the Old and New Testaments.
Also called Hebrew Scriptures. the collection of sacred writings of the Jewish religion: known to Christians as the Old Testament.
(often lowercase) the sacred writings of any religion.
(lowercase) any book, reference work, periodical, etc., accepted as authoritative, informative, or reliable:
He regarded that particular bird book as the birdwatchers’ bible.
Contemporary Examples

Polygamy, the Bible’s Ultimate Family Value Joel Baden December 21, 2013
Mad About Fonts Malcolm Jones October 3, 2011
Hollywood Declares 2014 the Year of the Bible Andrew Romano January 8, 2014
Polygamy, the Bible’s Ultimate Family Value Joel Baden December 21, 2013
Jim Harrison Can Make You a Better Animal John Avlon September 22, 2010

Historical Examples

Garrison’s Finish W. B. M. Ferguson
A Theological-Political Treatise [Part III] Benedict of Spinoza
The Last Look W.H.G. Kingston
The Conquest of Fear Basil King
The Uncalled Paul Laurence Dunbar

noun

the Bible, the sacred writings of the Christian religion, comprising the Old and New Testaments and, in the Roman Catholic Church, the Apocrypha
(as modifier): a Bible reading

the English name for Tanach
(often not capital) any book containing the sacred writings of a religion
(usually not capital) a book regarded as authoritative: the angler’s bible
n.

Walter Scott and Pope’s Homer were reading of my own election, but my mother forced me, by steady daily toil, to learn long chapters of the Bible by heart; as well as to read it every syllable through, aloud, hard names and all, from Genesis to the Apocalypse, about once a year; and to that discipline — patient, accurate, and resolute — I owe, not only a knowledge of the book, which I find occasionally serviceable, but much of my general power of taking pains, and the best part of my taste in literature. … [O]nce knowing the 32nd of Deuteronomy, the 119th Psalm, the 15th of 1st Corinthians, the Sermon on the Mount, and most of the Apocalypse, every syllable by heart, and having always a way of thinking with myself what words meant, it was not possible for me, even in the foolishest times of youth, to write entirely superficial or formal English …. [John Ruskin, “Fors Clavigera,” 1871]

Note: By extension, any book considered an infallible or very reliable guide to some activity may be called a “bible.”