“The same symbolism occurs in the Bahir, but without any antinomian overtones. The souls finally return home to the “house of the father,” whence the king’s son had taken them in order to bring them to his bride. This is reminiscent of the interpretation suggested by many earlier researchers for the gnostic “Hymn of the Soul,” an interpretation that evinces a tendency similar to that with which kabbalists—whether they were historically correct or not— read the symbolism of their sources. In fact, the “house of the father” appears there in a similar context.
The further exposition of this theme in sections 126-127 is rather curious. Once again reinterpreting a talmudic dictum, this text explains that the Messiah can come only when all the souls “in the body of the man” are exhausted and have ended their migration.
“Only then may the ‘new [souls]’ come out, and only then is the son of David allowed to be born. How is that? Because his soul comes forth new among the others.”
The soul of the Messiah is therefore not subject to migration. Here the kabbalistic doctrine evinces a characteristic note of its own. We are not dealing with a reminiscence from earlier doctrines of reincarnation such as are known to us in certain Judéo-Christian doctrines concerning the true prophet, as in the Pseudo-Clementines, which also exercised considerable influence upon corresponding idea among Shiite sects in Islam. There the soul of Adam, the true prophet, traverses the aeon, this world, in many shapes until it finally finds repose in the appearance of the Messiah.
Later on, the kabbalists themselves developed this idea independently, in their assumed chain of reincarnations— Adam-David-Messiah; this doctrine, however, is not known before the end of the thirteenth century. Could this thesis of the Bahir have come into being in the Orient, perhaps even in conscious opposition to certain current ideas? Did it develop completely independent of them? It is difficult to answer these questions.
The German Hasidim know nothing at all of the transmigration of souls and the ideas associated with it, as is shown by the detailed work of Eleazar of Worms on the soul, Hokhmath ha-Nefesh. According to the pessimistic view of the Cathars, all the souls in this world are nothing but fallen spirits. Here, too, there is a distinct contrast to the doctrine of the Bahir, which considers the descent of “new” souls, at any rate, as possible and determined by the good deeds of Israel.”
Gershom Scholem, Origins of the Kabbalah, pp. 190-1.