Genesis 32:33
Therefore the Bnei Yisroel eat not of the sinew of the thigh vein (gid hanasheh, sciatic nerve) which is upon the hip socket, unto this day; because he touched the hip socket of Ya'akov in the sinew of the thigh vein.
Orthodox Jewish Bible
In Context
32And as he passed over Penuel the shemesh rose upon him, and he limped upon his hip.