Zohar 3:21b-22a

Jewish Mysticism
The souls of people ascend, each one as is appropriate … Happy is the lot of the righteous for their souls ascend upward and they are not obstructed in another place that is not necessary. At midnight the herald stands and calls out, and the opening is opened. Then the wind of the north side is stirred, and it strikes the harp of David which plays by itself … Happy is the lot of the one who wakes at that time and is occupied with Torah. Whoever rises at that time and is occupied with Torah is called a partner of the Holy One, blessed be He, and the Community of Israel.

Translated by Elliot Wolfson in “Forms of Visionary Ascent and Ecstatic Experience,” in Gershom Scholem’s Major Trends in Jewish Mysticism 50 Years After 209-235. Edited by J. Dan and P. Schafer, Tubingen- J. C. B. Mohr, 1993.