Commentary for Avodah Zarah 58:2

Meat that is being brought into a place of idol worship is permitted to a Jew, since it has not yet been used for idol worship. It is of course not permitted to be eaten, since it probably is not kosher. However, one could use it to feed animals. Meat that is coming out of a place of idol worship is forbidden, since it was probably used for idolatry.

It is forbidden to conduct business with non-Jews who are on their way to worship idols, since they will thank their gods for their business with the Jews. In this way the Jew will indirectly be abetting idol worship. However, it is permitted to engage them in business on their return, since they have already completed their idol worship. [Note this last section is of a different subject than the other sections. It should have been included in chapter one. It probably was included here due to its similarity to the previous clause.]