Reference for Avodah Zarah 115:5

מתניתא דאגרדמים עובד כוכבים שקדח במינקת והעלה או שטעם מן הכוס והחזירו לחבית זה היה מעשה ואסרוהו מאי לאו בהנאה לא בשתייה

A tannaitic teaching: A non-Jewish market inspector who drilled a hole in [a cask of wine] with a tube and drew off [some wine], or he tasted some of it in a glass and returned [the remainder] to the cask. This happened and [the Rabbis] declared it forbidden. Is it not that it is prohibited to derive benefit from it? No, it is prohibited to drink it [but it is not prohibited to sell it].

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