The chief city of the country, called Rabbah, or Rabbath of the children of Ammon, i.e.
3 It was believed that the Written Word had an infinite fulness; according to the Midr. Bemidbar Rabbah every word of the Law had seventy different aspects, and Philo of Alexandria held that there are no superfluous words in Scripture.
The several portions are named after the ordinary Jewish titles of the Old Testament books with the addition of Rabbah " great."
1) Rabbah, on Genesis, the oldest and most valuable of haggadic Midrashim.
Ruth or Ruth Rabbah, a compilation including an exposition of 1 Chron.