The term BOOK HOLY is a reference to two of the most important religious texts in the world: the BIBLE and the KORAN. The BIBLE is the holy book of Christianity, composed of the Old Testament and the New Testament. It is believed to have been written over a period of centuries by many authors. The KORAN is the holy book of Islam, believed to be the word of God as revealed to the Prophet Muhammad. Both books are revered by their respective faiths and are seen as sacred texts.