“As a matter of fact, doctrines relating to cosmic cycles in the evolution of the world were also known in Jewish medieval literature outside the Kabbalah. Through the intermediary of Indian and Arabic sources, rather than under the influence of Platonic thoughts, ideas of this type slipped into astrological writings in particular. Abraham bar Hiyya in Aragon was familiar with them around 1125 as the “teachings of certain philosophers,” for he informs us that some of them say:
“ … After all the creatures have passed from potentiality to actuality, God once again returns them to potentiality as in the beginning and then brings them back to actuality a second and a third time, and thus without end. . . . Others again say that the days of the world are 49,000 years and that each of the seven planets reigns 7,000 years in the world. When at the end of 49,000 years they have completed their reign, God destroys His world, leaves it for 1,000 years in a state of tohu, and at the end of the fiftieth millennium He renews it as in the beginning.”
This is an astrological cosmic theory also known from Arabic sources, and the author adds that we are not permitted to accept such ideas, which are nothing more than mere suppositions. Ideas of this kind must have been known to other scholars also and no doubt circulated in other Jewish groups as is proved by the testimony of Mutahhar al-Maqdisi. Writing in the tenth century, he reports that a Jewish scholar—evidently in the Orient—assured him that certain of his coreligionists believed in a perpetual process of the re-creation of the world.”
Gershom Scholem, Origins of the Kabbalah, 1962, p. 462.