Genउत्पत्ति Genesisउत्पत्ति, chapterअध्याय Book of Genesisउत्पत्ति, chapterअध्याय 32

And when he saw that he prevailed not against him, he touched the hollow of his thigh; and the hollow of Ya’akov’s (he who holds onto the heel of) thigh was out of joint, as he wrestled with him.