And Malchut receives strength from the upper world, etc.: And Malchut receives strength, meaning Mochin, from the upper world, which is Bina, through Yaacov, a perfect man, who united both, because through the elevation of MAN, Malchut rose to Bina, and they united with each other. He united both above, because Bina received the form of Malchut, and this is Leah. And he united both below, because Malchut acquired the form of Bina, and this is Rachel. And from there came the 12 holy tribes, similar to those above. That is, like the 12 perspectives that are in Malchut above. Yaacov, who was perfect, brought love to both worlds, as We have established, because he married the two sisters, Leah and Rachel, who are Bina and Malchut, two worlds. The other sons of Adam who do this, reveal nakedness above and below, and cause hatred in the two worlds, and cause separation between Zeir Anpin and Leah, and between Zeir Anpin and Rachel, because the union above is with Leah, and the union below is with Rachel. This is what is said: "You shall not take a wife together with her sister for rivalry." They became rivals and filled with hatred towards each other.