עַל־כֵּ֡ן לֹֽא־יֹאכְל֨וּ בְנֵֽי־יִשְׂרָאֵ֜ל אֶת־גִּ֣יד הַנָּשֶׁ֗ה אֲשֶׁר֙ עַל־כַּ֣ף הַיָּרֵ֔ךְ עַ֖ד הַיּ֣וֹם הַזֶּ֑ה כִּ֤י נָגַע֙ בְּכַף־יֶ֣רֶךְ יַעֲקֹ֔ב בְּגִ֖יד הַנָּשֶֽׁה׃
Therefore the children of Yisrael do not eat the sciatic nerve that is on the hollow of the thigh, to this day, because he touched the hollow of Yaakov’s thigh on the sciatic nerve.
Torah Temimah points to Pesachim 22a / Chullin on the scope of the prohibition.
א"ר אבהו: כל מקום שנאמר לא יאכל וגו' אחד איסור אכילה ואחד איסור הנאה במשמע. והרי גיד הנשה דרחמנא אמר לא יאכלו, ותנן שולח אדם ירך לעובד כוכבים וגיד הנשה בתוכו.
Rabbi Abbahu said: Wherever it is stated “you shall not eat,” both a prohibition of eating and a prohibition of benefit are implied. Yet regarding the sciatic nerve the Torah said “they shall not eat,” and we learned that a person may send a thigh to a non-Jew with the sciatic nerve inside it.
The Gemara discusses whether the prohibition of gid hanasheh includes benefit or is limited to eating.
Derash on the scope of the prohibition (Bavli).
The prohibition of the sciatic nerve is primarily one of eating; benefit is treated differently.