Genesis 32:31-32

Young's Literal Translation

³¹ and the sun riseth on him when he hath passed over Penuel, and he is halting on his thigh;

³² therefore the sons of Israel do not eat the sinew which shrank, which [is] on the hollow of the thigh, unto this day, because He came against the hollow of Jacob's thigh, against the sinew which shrank.