Zohar 2:200a

Jewish Mysticism
Whoever is engaged in Torah it is as if he is engaged in the palace of the Holy One, blessed be He, for the supernal palace of the Holy One, blessed be He, is the Torah.

Translated by Elliot Wolfson in Through a Speculum that Shines- Vision and Imagination in Medieval Jewish Mysticism, Princeton- Princeton University Press, 1994.