Zohar 1:66b

Jewish Mysticism
Come and see the secret of the matter- When the righteous man is in the world, the Shekhinah does not depart from him, and her desire is for him. Consequently, the desire of love for her from above is like the desire of a male for a female when he is jealous of her.

Translated by Elliot Wolfson in “Eunuchs who Keep the Sabbath- Becoming Male and the Ascetic Ideal in Thirteenth Century Jewish Mysticism,” in Becoming Male in the Middle Ages, 151-185. Edited by J. J. Cohen and B. Wheeler. New York- Garland, 1997.