No-one knows. The earliest documents which are generally acknowledged as being Kabbalistic come from the 1st. Century C.E., but there is a suspicion that the Biblical phenomenon of prophecy may have been grounded in a much older oral tradition which was a precursor to the earliest recognisable forms of Kabbalah. Some believe the tradition goes back as far as Melchizedek. There are moderately plausible arguments that Pythagoras received his learning from Hebrew sources. There is a substantial literature of Jewish mysticism dating from the period 100AD - 1000AD which is not strictly Kabbalistic in the modern sense, but which was available as source material to medieval Kabbalists.

On the basis of a detailed examination of texts, and a study of the development of a specialist vocabulary and a distinct body of ideas, Scholem has concluded that the origins of Kabbalah can be traced to 12th. century Provence. The origin of the word "Kabbalah" as a label for a tradition which is definitely recognisable as Kabbalah is attributed to Isaac the Blind (c. 1160-1236 C.E.), who is also credited with being the originator of the idea of sephirothic emanation.

Prior to this (and after) a wide variety of terms were used for those who studied the tradition: "masters of mystery", "men of belief", "masters of knowledge", "those who know", "those who know grace", "children of faith", "children of the king's palace", "those who know wisdom", "those who reap the field", "those who have entered and left".