Avodah Zarah 32A

האי חלא דשיכרא דארמאה אסור, דמערבי ביה דורדיא דיין נסך. אמר רב אשי: ומאוצר שרי, כיון דמערבי ביה מסרא סרי.

This vinegar made of Aramean beer is prohibited, as they mix in it yeast of wine used for a libation. Rav Ashi said: But vinegar from a storeroom is permitted, since if another substance is mixed with it, it would spoil over time.

וחרס הדרייני. מאי הדרייני? אמר רב יהודה אמר שמואל: חרס של הדריינוס קיסר. כי אתא רב דימי אמר: קרקע בתולה היתה שלא עבדה אדם מעולם, עבדה ונטעה, ורמי ליה לחמרא בגולפי חיורי, ומייצי להו לחמרייהו, ומתברו להו בחספי ודרו בהדייהו, וכל היכא דמטו תרו להו ושתו. אמר רבי יהושע בן לוי: וראשון שלנו כשלישי שלהן.

§ The Mishnah teaches: And Hadrianic earthenware is prohibited. The Talmud asks: What is Hadrianic earthenware? Rav Yehuda says that Shmuel says: It is earthenware of Emperor Hadrian. When Rav Dimi came, he said: There was an expanse of virgin soil that no man had ever tilled before, and Hadrian tilled it and planted grapevines in it, which yielded wine of the highest quality. And they placed this wine in white jugs, and the jugs absorbed the wine. And they would break the jugs into shards and carry the shards with them, and anywhere that they stopped, they soaked these shards in water and drank the water. The Talmud notes that R' Yehoshua ben Levi says: And our first-rate wine is like the wine produced by the third usage of their Hadrianic earthenware.

איבעיא להו: מהו לסמוך בהן כרעי המטה? רוצה בקיומו על ידי דבר אחר ⁠— שרי או אסור?

A dilemma was raised before the rabbis: What is the halakha if one wishes to use such shards to support the legs of a bed with them? Is one who desires a prohibited item’s continued existence in order to use it for another matter, i.e., not for the prohibited purpose, permitted to use it or prohibited from doing so? In this case, no benefit whatsoever is derived from the wine absorbed within the shards, but the shards themselves are being used to support the bed.