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Mekhilta.The Mekhilta essentially functions as a commentary on the book of Exodus. There are two versions of this midrash collection. One is Mekhilta de Rabbi Ishmael, the other is Mekhilta de Rabbi Simeon bar Yohai. The former is still studied today, while the latter was used by many medieval Jewish authorities. While the latter (bar Yohai) text was popularly circulated in manuscript form from the 11th to 16th centuries, it was lost for all practical purposes until it was rediscovered and printed in the 19th century.

- Mekhilta de Rabbi Ishmael. This is a halakhic commentary on Exodus, concentrating on the legal sections, from Exodus 12 to 35. It derives halakha from Biblical verses. This midrash collection was redacted into its final form around the 3rd or 4th century; its contents indicate that its sources are some of the oldest midrashim, dating back possibly to the time of Rabbi Akiva. The midrash on Exodus that was known to the Amoraim is not the same as our current mekhilta; their version was only the core of what later grew into the present form.

- Mekhilta de Rabbi Simeon bar Yohai. Based on the same core material as Mekhilta de Rabbi Ishmael, it followed a second route of commentary and editing, and eventually emerged as a distinct work. The Mekhilta de Rabbi Simeon bar Yohai is an exegetical midrash on Exodus 3 to 35, and is very roughly dated to near the 4th century.