Translation:Mishnah/Seder Nezikin/Tractate Avodah Zarah/Chapter 1/5

English Translation
 The following items are those that are forbidden to be sold to gentiles: iztrobalin, white figs along with their stalks, frankincense, and white chickens. Rabbi Yehuda says: he sells a white chicken to him amongst a group of chickens; in the time that he is by himself, he must clip its toe and sell it, since they do not sacrifice blemished animals to idols. As for all the remaining items, (if their purpose) is not known, it is permitted (to sell), but (if their purpose) is known, it is forbidden (to sell). Rabbi Meir says: even if the items are fine palm dates, sweet dates or the Nikolaos date, it is still forbidden to sell them to gentiles. 

Explanation
משנה עבודה זרה א ה