Kabbalah su Genesi 32:26

But Jacob was strong on all sides, on the side of Isaac and the side of Abraham. (Samael) came to the right and saw Abraham, strong with the vigor of day, namely, the right side, which is Chesed. He came to the left, and saw Isaac, powerful with the strength of rigorous judgment. He came to the body and saw Jacob strong on these two sides. They surrounded him, one from here and one from there. Then "when he saw that he did not prevail against him, he touched the hollow of his thigh" (Beresheet 32:26), a place outside the body, the one pillar of the body. Then "and the hollow of Jacob's thigh was put out of joint, as he wrestled with him...".