Sacred history is the parts of the Torah narrative on the boundary of historicity, especially the Moses and Exodus stories which can be argued to have a remote historical nucleus without any positive evidence to the effect.
In a wider sense, the term is used for all of the historical books of the Bible, i.e. Books of Kings, Ezra-Nehemiah and Books of Chronicles, spanning the period of the 10th to 5th centuries BC, and by extension also of the later books such as Maccabees and the books of the New Testament. The term in this sense is used by Thomas Ellwood in Sacred history, or, the historical part of the holy scriptures of the Old and New Testaments, published 1709.
In yet another sense, the term may refer to ecclesiastical history.