Zohar 1:89a

Jewish Mysticism
Rabbi Elazar Said, “When the Holy One, blessed be He, created the world, it was conditional, ‘for when Israel comes, if they will accept the Torah, fine, and if not, I will return everything to chaos.’ And the world was not established until Israel stood on Mt. Sinai and received the Torah, and thus the world was established. And from that day forward, the Holy One, blessed be He, creates worlds. And what are these worlds? Human couples. For from that time forward, the Holy One brings couples together, saying, “this the daughter of so-and-so for that so-and-so,” and these are the worlds that He creates.

Translated by Hartley Lachter