Mishnah

The Mishnah or Mishna (, "study by repetition", from the verb shanah, or "to study and review", also "secondary") is the first authoritative collection of exegetical material of the Jewish comprising the oral tradition of Jewish law known as the "Oral Torah".

Redaction
The Mishnah was redacted by Judah the Prince and his colleages at the beginning of the third century AD. Most of the Mishnah is written in Mishnaic Hebrew, while some parts are Aramaic. The views of the rabbinic sages (called tannaim) are recorded in the Mishnah.

Divisions
The Mishnah is divided into six orders (sedarim). These in turn are divided into tractates (massekhtoth) comprising a total of 63 tractates. These, in turn, are divided into chapters comprising a total of 524 chapters including the sixth chapter of Pirké Avoth, which is a later addition. Each chapter has a number of halachot. The Talmud generally follows this same structure.