For our knowledge of their doctrinal system, however, we still depend chiefly upon the sacred books already mentioned, consisting of fragments of very various antiquity derived from an older literature.8 Of these the largest and most important is the Sidra' rabbd (" Great Book"), known also as Ginza - ("Treasure"), consisting of two unequal parts, of which the larger is called yamina (to the right hand) and the smaller s'znala (to the left hand), because of the manner in which they are bound together.
9 The first printed edition and translation of the Sidra rabba, by Matth.
It is also known as Sidra' d'neshmatha, " Book of Souls," and besides hymns and doctrinal discourses contains prayers to be offered by the priests at sacrifice and at meals, as well as other liturgical matter.
The Sidra Rabbet knows of three total destructions of the human race by fire and water, pestilence and sword, a single pair alone surviving in each case.
The Sidra Rabba lays great stress upon the duty of procreation, and marriage is a duty.