Masseket Azilut
Massekhet Azilut (Hebrew: מסכת אצילות, romanized: māsekheth ʾəṣiluth, lit. 'Tractate of Atzilut') is an anonymous kabalistic work from the early 14th century. It is the earliest literary product of speculative Kabbala that contains the doctrine of the Four Worlds, a doctrine not contained in the Zohar, as well as that of the concentration of the Divine Being.