Translation:Mishnah/Seder Nezikin/Tractate Avodah Zarah/Chapter 2/3

English Translation
 These are the things of gentiles that are prohibited and are prohibited from deriving benefit from them at all. Wine, the vinegar of gentiles, which in the beginning was wine, Hadrianic earthenware, and hides that were pierced at the heart. Rabbi Shimon ben Gamliel says, 'If the hole was round at the time of the piercing it is prohibited, but if it was straight, (literal:drawn, pulled) it is allowed. Meat that was coming to an idol, it is allowed, but meat that was coming out, it is prohibited. Because it is like sacrifices of the dead; the words of Rabbi Akiva. Those who are going on an idolatrous pilgrimage, it is forbidden to do business with them. But, those who are coming back, it is permitted. (To do business with them) 

Explanation
עבודה זרה פרק ב משנה ג