Chulin7: 3
הָאוֹכֵל מִגִּיד הַנָּשֶׁה כְזַיִת, סוֹפֵג אַרְבָּעִים. אֲכָלוֹ וְאֵין בּוֹ כַזַּיִת, חַיָּב. אָכַל מִזֶּה כְזַיִת וּמִזֶּה כְזַיִת, סוֹפֵג שְׁמֹנִים. רַבִּי יְהוּדָה אוֹמֵר: אֵינוֹ סוֹפֵג אֶלָּא אַרְבָּעִים.
[If] one eats an olive’s volume of the sinew of the thigh, he incurs forty lashes. [If] he ate it, and it does not contain an olive’s volume, he is [also] liable. [If] he ate an olive’s volume of this one and an olive’s volume of that one, he incurs eighty lashes. R’ Yehudah says: He incurs only forty.
Chulin7: 4
יָרֵךְ שֶׁנִּתְבַּשֵּׁל בָּהּ גִּיד הַנָּשֶׁה, אִם יֶשׁ־ בָּהּ בְּנוֹתֵן טַעַם, הֲרֵי זוֹ אֲסוּרָה. כֵּיצַד מְשַׁעֲרִין אוֹתָהּ? כְּבָשָׂר בְּלֶפֶת.
A thigh in which the sinew of the thigh was cooked — if it contains the amount that can receive a flavor, it is prohibited. How do we evaluate it? Like meat in turnips.