H. P. Blavatsky

Kabalah. The hidden wisdom of the Hebrew Rabbis of the middle ages derived from the older secret doctrines concerning divine things and cosmogony, which were combined into a theology after the time of the captivity of the Jews in Babylon. All the works that fall under the esoteric category are termed Kabalistic.

Source: H. P. Blavatsky, The Theosophical Glossary, art. Kabalah