דא"ר יוחנן משום ר"ש בן יהוצדק מים של רבים אין נאסרין הא דיחיד נאסרין
as Rabbi Yoḥanan says in the name of Rabbi Shimon ben Yehotzadak: Water that belongs to the public is not rendered prohibited. The Gemara infers that since water that belongs to the public is permitted, therefore, in a case where gentiles bow to water that is owned by an individual it is rendered prohibited.
ותיפוק ליה דהא מחוברין נינהו לא צריכא דתלשינהו גלא
The Gemara challenges: But Rabbi Yoḥanan could derive that even water owned by an individual is permitted, as the water is connected to the ground, and worshipping an object that is connected to the ground does not render it prohibited. The Gemara explains: No, it is necessary to derive this halakha from the fact that the water belongs to the public in a case where a wave raised the water and detached it from the ground. In this case worshipping water owned by an individual would render it prohibited.
סוף סוף אבני הר שנדלדלו נינהו תסתיים דר' יוחנן דאמר אסורות
The Gemara challenges: Nevertheless, the water ultimately falls into the category of objects that were detached without human involvement, such as boulders of a mountain that dislodged on their own. The Gemara (46a) cites a dispute between Rabbi Yoḥanan and the sons of Rabbi Ḥiyya with regard to boulders that dislodged without human involvement and were then worshipped, and does not conclude who deems the boulders permitted and who deems them prohibited. May it be concluded from Rabbi Yoḥanan’s statement that it is Rabbi Yoḥanan who says that the boulders are prohibited?
לא צריכא דטפחינהו בידיה
The Gemara replies: No, even if Rabbi Yoḥanan deems the boulders permitted, his ruling with regard to the water is necessary in a case where one struck the water with his hand and thereby detached it. Since it was detached due to human involvement, if the water was owned by an individual it is prohibited.
ר' חייא בר אבא איקלע לגבלא חזא בנות ישראל דמיעברן מעובדי כוכבים שמלו ולא טבלו חזא חמרא דמזגו עובדי כוכבים ושתו ישראל חזא תורמוסא דשלקי להו עובדי כוכבים ואכלי ישראל ולא אמר להו ולא מידי
§ Rabbi Ḥiyya bar Abba happened to come to Gavla. He saw Jewish women there who were impregnated by gentiles who were in the process of converting and were circumcised but had not yet immersed in a ritual bath. He also saw wine that gentiles diluted with water and Jews then drank the wine. He also saw lupines that gentiles were cooking and Jews were eating. And despite seeing all this, he did not say anything to them to correct their actions.
אתא לקמיה דרבי יוחנן א"ל צא והכרז על בניהם שהן ממזרים ועל יינן משום יין נסך ועל תורמוסן משום בישולי עובדי כוכבים משום שאינן בני תורה
Later, he came before Rabbi Yoḥanan and told him what he had seen. Rabbi Yoḥanan said to him: Go and declare about their children that they have the status of children born from an incestuous or adulterous relationship [mamzerim]. And decree with regard to their wine that it is prohibited as an extension of the prohibition of wine used for a libation. And with regard to their lupines you should declare that they are forbidden due to the prohibition of food cooked by gentiles, as they are not people well-versed in Torah, and any leniency would be misunderstood and applied too extensively.
על בניהם שהם ממזרים ר' יוחנן לטעמיה דא"ר יוחנן לעולם אינו גר עד שימול ויטבול וכיון דלא טביל עובד כוכבים הוא ואמר רבה בר בר חנה א"ר יוחנן עובד כוכבים ועבד הבא על בת ישראל הולד ממזר
The Gemara explains that with regard to declaring about their children that they have the status of mamzerim, Rabbi Yoḥanan conforms to his standard line of reasoning concerning two halakhot. The first is as Rabbi Yoḥanan says: One is never deemed to be a convert until he has been circumcised and has immersed. And since the father has not immersed, he is still considered a gentile. And the second halakha is as Rabba bar bar Ḥana says that Rabbi Yoḥanan says: In the case of a gentile or a Canaanite slave who engaged in intercourse with a Jewish woman, the offspring is a mamzer.
וגזור על יינם משום יין נסך משום לך לך אמרין נזירא סחור סחור לכרמא לא תקרב
The Gemara continues to explain Rabbi Yoḥanan’s second instruction to Rabbi Ḥiyya bar Abba: And decree with regard to their wine that it is prohibited as an extension of the prohibition of wine used for a libation. Although the gentile did not touch the wine when he diluted it, it is prohibited due to the maxim: Go, go, we say to a nazirite; go around and go around, but do not come near to the vineyard.
ועל תורמוסן משום בישולי עובדי כוכבים לפי שאינן בני תורה טעמא דאינן בני תורה הא בני תורה שרי והאמר רב שמואל בר רב יצחק אמר רב כל שנאכל כמות שהוא חי אין בו משום בישולי עובדי כוכבים
Lastly, Rabbi Yoḥanan instructed Rabbi Ḥiyya bar Abba to decree with regard to their lupines that they are forbidden due to the prohibition of food cooked by gentiles, as they are not people well-versed in Torah. The Gemara asks: The reason that the lupines are deemed prohibited is because they are not people well-versed in Torah; but in the case of people who are well-versed in Torah, one can infer that the lupines are permitted. But doesn’t Rav Shmuel bar Rav Yitzḥak say that Rav says: Anything that is eaten raw is not subject to the prohibition of food cooked by gentiles, even when cooked by them? Lupines are not eaten raw due to their bitterness, and therefore they are subject to the prohibition of food cooked by gentiles.
ר' יוחנן כי הך לישנא ס"ל דאמר רב שמואל בר רב יצחק אמר רב כל שאינו עולה לשולחן של מלכים ללפת בו את הפת אין בו משום בישולי עובדי כוכבים טעמא דאינן בני תורה הא בני תורה שרי
The Gemara answers: Rabbi Yoḥanan holds in accordance with that other version of Rav Shmuel bar Rav Yitzḥak’s statement, as Rav Shmuel bar Rav Yitzḥak says that Rav says: Anything that lacks importance and therefore does not appear on the table of kings in order to be eaten together with bread is not subject to the prohibition of food cooked by gentiles. Lupines are not sufficiently important to be served on the table of kings, and therefore they are permitted even if cooked by gentiles. Consequently, the reason for prohibiting the residents of Gavla from eating them is because they are not people well-versed in Torah. But in the case of people well-versed in Torah, the lupines are permitted.
בעו מיניה מרב כהנא עובד כוכבים מהו שיוליך ענבים לגת אמר להו אסור משום לך לך אמרין נזירא סחור סחור לכרמא לא תקרב איתיביה רב יימר לרב כהנא עובד כוכבים שהביא ענבים לגת בסלין
§ The Sages asked Rav Kahana: With regard to a gentile, what is the halakha concerning the following question: May he bring grapes to the winepress without doing anything else to them? Rav Kahana said to them: It is prohibited by rabbinic decree due to the maxim: Go, go, we say to a nazirite; go around and go around, but do not come near to the vineyard. Rav Yeimar raised an objection to Rav Kahana from a baraita: With regard to a gentile who brought grapes to the winepress in baskets