Part of Judaism. Introduced 1740 CE.
"About 1740 the Besht established himself in the Ukrainian town of Mezhebuzh. He gathered about him numerous disciples and followers, whom he initiated into the secrets of his teachings not by systematic exposition, but by means of sayings and parables that contained both easily graspable insights, for the laymen, and profound Kabbalistic depth, for the great scholars. These sayings spread by oral transmission; later the founder's disciples set them in writing, developing the thoughts of their master into a system. " (Wikipedia)