(8) Daniel resolved not to defile himself with the king’s food or the wine he drank, so he sought permission of the chief officer not to defile himself.
עבודה זרה ל׳ ב - ל״א א
א"ר אסי א"ר יוחנן משום ר' יהודה בן בתירא שלשה יינות הן יין נסך אסור בהנאה ומטמא טומאה חמורה בכזית סתם יינם אסור בהנאה ומטמא טומאת משקין ברביעית המפקיד יינו אצל עובד כוכבים אסור בשתיה ומותר בהנאה.
Avodah Zarah 30b - 31a
Rabbi Assi said in the name of Rabbi Yochanan who said it on behalf of Rabbi Judah ben Beteira: There are three kinds of wine: Libation wine (יין נסך), from which it is forbidden to derive any benefit, and of which a quantity of the size of an olive causes grave defilement; Ordinary wine [of non-Jews] (סתם יינם), from which it is likewise forbidden to derive any benefit whatsoever, and a quarter [of a log ~ .125 liter] of which renders drinks [or edibles] unclean; Wine [of an Israelite] (יינו) that had been deposited with an idolater, which must not be drunk, but the benefit of it is permitted.
וגניבא משמיה דרב אמר כולן משום עבודת כוכבים גזרו בהן דכי אתא רב אחא בר אדא א"ר יצחק גזרו ... על פיתן ושמנן משום יינן ועל יינן משום בנותיהן ועל בנותיהן משום דבר אחר.
Geneba said in the name of Rav: With all the things against which they decreed the purpose was to safeguard against idolatry. For when Rav Aha bar Ada came [from Palestine] he declared in the name of Rabbi Isaac: They decreed ... against their bread and oil on account of their wine; against their wine on account of their daughters; against their daughters on account of "another matter".
שמואל ואבלט הוו יתבי אייתו לקמייהו חמרא מבשלא משכיה לידיה א"ל שמואל הרי אמרו יין מבושל אין בו משום יין נסך.
Samuel and Ablet were sitting together when boiled wine was brought up for them and [Ablet] withdrew his hand, but Samuel said to him: Behold, [the sages] said that boiled wine (יין מבושל) is not to be suspected of idolatrous use (יין נסך)!
הַגָּה: ... וּבַזְּמַן הַזֶּה דְּהַגּוֹיִים לָאו עוֹבְדֵי עֲבוֹדָה זָרָה הֵם, כָּל מַגָּעָן מִקְרֵי שֶׁלֹּא בְּכַוָּנָה, וְלָכֵן אִם נָגַע בַּיַּיִן עַל יְדֵי דָּבָר אַחֵר, אַף עַל פִּי שֶׁיּוֹדֵעַ שֶׁהוּא יַיִן וְכִוֵּן לִגֹּעַ בּוֹ, מֻתָּר אֲפִלּוּ בִּשְׁתִיָּה ... וְאֵין לְפַרְסֵם הַדָּבָר בִּפְנֵי עַם הָאָרֶץ.
Gloss [of Rabbi Moses Isserles]: ... In our time, when non-Jews are not idol worshipers, any of their contact [with non-boiled Jewish wine] is considered unintentional, and therefore if [a non-Jew] touches wine indirectly, even if he knows it is wine and intends to touch it, it is permitted [for Jews] even to drink it ... But one should not publicize this fact to the unlearned.