Ein Sof, or Eyn Sof (, Hebrew: אֵין סוֹף ʾēn sōf; meaning "infinite", lit. '(There is) no end'), in Kabbalah, is understood as God before any self-manifestation in the production of any spiritual realm, probably derived from Solomon ibn Gabirol's (c. 1021 – c. 1070) term, "the Endless One" (שֶׁאֵין לוֹ תִּקְלָה, šeʾēn lo tiqlā). Ein Sof may be translated as "unending", "(there is) no end", or infinity. It was first used by Azriel of Gerona (c. 1160 – c. 1238), who shared the Neoplatonic belief that God can have no desire, thought, word, or action, emphasized by the negation of any attribute.
This is the origin of the Ohr Ein Sof or "Infinite Light" of paradoxical divine self-knowledge, nullified within the Ein Sof before creation. In Lurianic Kabbalah, the first act of creation, the tzimtzum or self-withdrawal of the divine to create a space, takes place from there.