Protocanonical books

Old Testament books also in the Hebrew Bible

The protocanonical books are those books of the Old Testament that are also included in the Hebrew Bible and that came to be considered canonical during the formational period of orthodox Christianity. The Old Testament is entirely rejected by some forms of Gnosticism, but the Hebrew Bible was adhered to even more tightly by Jewish Christians than Gentile Christians. The term protocanonical is often used to contrast these books to the deuterocanonical books or apocrypha, which "were sometimes doubted" by some in the early church, and are considered non-canonical by most Protestants.

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