The Masoretic Text is the authoritative Hebrew and Aramaic text of the 24 books of the Hebrew Bible (Tanakh) in Rabbinic Judaism. The Masoretic Text defines the Jewish canon and its precise letter-text, with its vocalization and accentuation known as the masora. Referring to the Masoretic Text, masora specifically means the diacritic markings of the text of the Jewish scriptures and the concise marginal notes in manuscripts of the Tanakh which note textual details, usually about the precise spelling of words. It was primarily copied, edited, and distributed by a group of Jews known as the Masoretes between the 7th and 10th centuries of the Common Era. The oldest known complete copy, the Leningrad Codex, dates to 1009 CE and is recognized as the most complete source of biblical books in the Ben Asher tradition. It has served as the base text for critical editions such as the Biblia Hebraica Stuttgartensia and Biblia Hebraica Leningradensia.