אִימֵּיהּ דְּאַבָּיֵי עֲבַדָא לֵיהּ, וְלָא אֲכַל. דְּבֵיתְהוּ דִּזְעִירָא עֲבַדָא לֵיהּ לְרַב חִיָּיא בַּר אָשֵׁי, וְלָא אֲכַל. אֲמַרָה לֵיהּ: לְרַבָּךְ עֲבַדִי לֵיהּ וַאֲכַל, וְאַתְּ לָא אָכְלַתְּ? אָמַר רָבָא בַּר שְׁבָא: הֲוָה קָאֵימְנָא קַמֵּיהּ דְּרָבִינָא וּבְחַשִׁי לֵיהּ בְּשׁוּפְתָּא דְתוּמָא וַאֲכַל.
The Gemara relates: Abaye’s mother, actually his foster mother, prepared mustard for him, and he did not eat it. Ze’eira’s wife prepared mustard for Rav Ḥiyya bar Ashi, her husband’s student, and he did not eat it. She said to him: I made this for your rabbi and he ate it, and you do not eat it? Rava bar Shabba said: I was standing before Ravina, and they stirred mustard for him with the inner part of the garlic, and he ate it.
אָמַר רַב חִסְדָּא: שִׁירְקָא טַוְיָא — שְׁרֵי, פִּיעְפּוּעֵי בֵיעֵי — אָסוּר. דְּבֵיתְהוּ דִּזְעֵירִי עֲבַדָא לֵיהּ לְחִיָּיא בַּר אָשֵׁי, וְלָא אֲכַל. אֲמַרָה לֵיהּ: לְרַבָּךְ עֲבַדִי לֵיהּ וַאֲכַל, וְאַתְּ לָא אָכְלַתְּ?! זְעֵירִי לְטַעְמֵיהּ, דְּאָמַר זְעֵירִי: נוֹתֵן אָדָם יַיִן צָלוּל וּמַיִם צְלוּלִין לְתוֹךְ הַמְשַׁמֶּרֶת בְּשַׁבָּת וְאֵינוֹ חוֹשֵׁשׁ. אַלְמָא כֵּיוָן דְּמִשְׁתְּתֵי הָכִי — לָאו מִידֵּי קָעָבֵיד, הָכָא נָמֵי כֵּיוָן דְּמִיתְּכִיל הָכִי — לָאו מִידֵּי קָעָבֵיד.
Rav Ḥisda said: Melon juice, which is beneficial for the intestines, may be strained and drunk on Shabbat (ge’onim). The juice of pipuim, which are a type of vegetable (Rashba), may not be drunk on Shabbat. The Gemara relates: Ze’iri’s wife made melon juice for Ḥiyya bar Ashi and he did not consume it. She said to him: I made it for your Rabbi, Ze’iri, and he ate it, and you do not eat it? The Gemara explains: Ze’iri followed his own reasoning in permitting this drink, as Ze’iri said: One may place clear wine and clear water into a strainer used to strain dregs from wine on Shabbat without concern. Apparently, since the wine and water are drunk even with what little dregs may remain, one is doing nothing to improve them. Here, too, since melon juice is consumed this way, without being strained and for non-medical purposes, one is doing nothing and it is permitted.