In the Talmud, the Shekinah was a neutral figure: it had neither sex nor gender. In Kabbalah, however, the Shekinah becomes the female aspect of God.
Armstrong traces the doctrinal transformation of Shekhinah from a gender-neutral Talmudic concept into Kabbalah’s explicitly feminine tenth sefirah, identified with Gnostic Sophia in exile.
, A History of God, 1993thesis