Tosefta do Awoda zara 2:16

One who slaughters in the name of the sun, the name of the moon, the name of the stars, the name of the [zodiacal] constellations, for the sake of Michael, minister of the great army, or for the sake of a small worm, behold, [in all those cases] this is [considered like] the meat of offerings to the dead, [from which benefit is forbidden (see Hullin 40a:2)]. One may not slaughter [so that the blood runs] either into the seas, or into the rivers (Hullin 2:9), or into murky water, but he may slaughter [so that the blood flows] into a goblet of water, or on a ship [he may let it flow] into a vessel, and if there is no place on the ship he can slaughter into the sea, and if he does not want to sully his house, he may slaughter inside a a vessel or inside a hole (ibid.). But in the market he should not do so because this is what is done by those who worship the stars. If he does this, he should be checked [to ensure he does not harbor heretical beliefs]. Meat that is found in the hand of a star-worshipper is permitted to benefit from; in the hand of a [Jewish] heretic it is forbidden to benefit from; from the house of a heretic, behold, it is [considered to be like] the meat of the sacrifices of the dead (Ps. 106:28), as it is said, "The slaughter of the heretic [is tantamount to slaughter] for the sake of star-worship (i.e., idolatry), and a their bread is the bread of star-worshippers, and their wine is the wine of libation [of star-worshippers], and their produce is [all considered] untithed (see Kutim 1:7), and their books are the books of sorcery, and their children are [considered to be] mamzers, and we do not sell to them, and we do not buy from them, and we do not marry their daughters (lit, "marry from them"), and we do not give [our daughters] to them, [and] we do not teach their children an occupation, and we do not [accept] treatment from them, either monetary treatment or medical treatment" (cf. Avodah Zarah 2:2). It so happened with Rabbi Eliezer ben Dama, the son of Rabbi Yishmael's sister, that a snake bit him, and along came Ya'akov, a man from K'far Sachnai, to heal him (Vienna Man. adds, "in the name of Yeshua ben Panteira," see also Y. Avodah Zarah II.2.11), and Rabbi Yishmael did not allow it. He said to him, "You are not allowed, ben Dama." He said to him, "I will bring you proof that he can heal me," but he did not have enough time to bring him proof before he died. Rabbi Yishmael said, "Ben Dama is fortunate that he departed to eternal peace, and did not tear down the fences of the Sages, before [divine] retribution came upon him," as it is said (Ecc. 10:8), "He who tears down a fence will be bitten by a snake." [And] it so happened with Rabbi Eliezer that he was apprehended on the words of the heretics (meaning ambiguous), and they brought him before the court to render judgment (Avodah Zarah 16b:15). The hegemon said to him, "Is an old man like you [really] occupied in such matters?" [Rabbi Eliezer] said to him, "The Judge is trusted by me." The hegemon thought that Rabbi Eliezer was talking about no one else but him, although Rabbi Eliezer did not intend [to refer to anyone] but his Father in heaven. The hegemon said to him, "Since you trusted only in me, thus I say: It is possible that such old ones [as yourself] error on such matters (i.e., listening to the words of heretics). [Thus, you are] acquitted; you are exempt." And at the time that he was freed from the court, he was sorry that he had been arrested on the words of the heretics, and his students came to him to console him, and he did not accept [their consolation]. [Thereafter,] Rabbi Akiva entered [Rabbi Eliezer's house] and said to him, "Rabbi, may I speak before you to ease your distress?" He said to him, "Speak." He said to him, "Perhaps one of the heretics said to you a word of heresy (i.e., one of his teachings) that pleased you." He said to him, "Yes." He said to him, "By the heavens, you reminded me! One time I was walking in the camp of Sepphoris, when I met a man of K'far Sachnai, and he said a word of heresy (Vienna Man. adds, "in the name of Yeshua ben Panteira," see also Avodah Zarah 17a:1), and I enjoyed it, and thus I was apprehended on the words of heresy, such that I transgressed the words of Torah, "Remove your way from her, and do not approach the entrance of her house" (Prov. 5:8), "for she has cast down many wounded" (Prov. 7:26). And thus Rabbi Eliezer says, "A man should always flee from ugliness, and from anything that resembles ugliness" (Avot D'Rabbi Natan 2:2).

These are the “hides pierced at the heart” [which are mentioned in m. Avodah Zarah 2:3]: All that are perforated at its heart and made like a kind of aperture [in the roof looking to the ground floor]. But if it is straight, it is permitted. Preserved and boiled produce of idolators, into which it is customary to put wine and vineyard and Hadrianic earthenware, [they are subject to] a prohibition on benefit according to Rabbi Meir but the Sages say they are not subject to a prohibition on benefit. Pressed olives that are sold at the entrances to bathhouses are prohibited for eating and permitted for benefit. Rabbi Yosei prohibits them even for benefit because they pour vinegar on them in order to remove their pits.