Criticism of the Bible is an interdisciplinary field of study concerning the factual accuracy of the claims and the moral tenability of the commandments made in the Bible, the holy book of Christianity. Devout Christians have long regarded their Bible as the perfect word of God (and devout Jews have held the Hebrew Bible similarly in high regard). Scholars and scientists have endeavored for centuries to scrutinise biblical texts to establish their origins (a related field of study known as biblical criticism) and validity. In addition to concerns about ethics in the Bible, about biblical inerrancy, or about the historicity of the Bible, there remain some questions of biblical authorship and as to what material to include in the biblical canon.