Reference for Avodah Zarah 64:7

ההולכין לתרפות אסורין לשאת ולתת עמהם: אמר שמואל עובד כוכבים ההולך לתרפות בהליכה אסור דאזיל ומודי קמי עבודת כוכבים בחזרה מותר מאי דהוה הוה

With idolaters going to a place of idolatry, it is forbidden to have any business transactions. Shmuel said: With idolaters going to a place of idolatry, on their way there, it is forbidden [to have business transactions], for they will go and offer thanks to the idols; but on their return it is permitted, for what has happened has already happened.

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