Kabbalah su Numeri 18:23

(37) And the kindling of love is truly happiness, and this is the fire that comes from the left side, which is the wine that makes happiness, and it is the what brings about connection, and so too it is explained in the Zohar (Korach, 178b) regarding the issue of "and the Levite, he will work" (Numbers 18:23) - and this is the text: "He will complete a completeness, and be one with all. He - simply to receive the congregation of Israel, as it says "and His left hand is under my head" (Songs, 2:6), in the sense of the connection of a pair as one. Who says love? It is "he". Until here the words of the text. And there, there are many explanations for the word "he", and in this explanation "he" is in Binah, and from there the happiness of the congregation of Israel arouses, in the pairing, in a way that the World of Emanations will unite and become completely one. It is seen that the essence of happiness is the union and connection of the World of Emanations all as one, and see that through the One Who Emanates, this is all the happiness that they illuminate and become one, all as one, until the One Who Emanates will illuminate them, as appropriate.