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Commentaries (405–420)

For the next 15 years, until he died, Jerome produced a number of commentaries on Scripture, often explaining his translation choices in using the original Hebrew rather than suspect translations. His patristic commentaries align closely with Jewish tradition, and he indulges in allegorical and mystical subtleties after the manner of Philo and the Alexandrian school. Unlike his contemporaries, he emphasizes the difference between the Hebrew Bible "Apocrypha" and the Hebraica veritas of the protocanonical books. In his Vulgate's prologues, he describes some portions of books in the Septuagint that were not found in the Hebrew as being non- canonical (he called them apocrypha); for Baruch, he mentions by name in his Prologue to Jeremiah and notes that it is neither read nor held among the Hebrews, but does not explicitly call it apocryphal or "not in the canon". His Preface to the Books of Samuel and Kings (commonly called the Helmeted Preface) includes the following statement:

This preface to the Scriptures may serve as a "helmeted" introduction to all the books which we turn from Hebrew into Latin, so that we may be assured that what is not found in our list must be placed amongst the Apocryphal writings. Wisdom, therefore, which generally bears the name of Solomon, and the book of Jesus, the Son of Sirach, and Judith, and Tobias, and the Shepherd are not in the canon. The first book of Maccabees I have found to be Hebrew, the second is Greek, as can be proved from the very style.