Eruvin 29B

דלא אבציל זירתא, אבל אבציל זירתא ⁠— לית לן בה.

in a case where the bulb has not grown to the size of a span, the distance between the thumb and the little finger of a hand that is spread apart, because at that stage the leaves are very toxic; however, if it has grown to the size of a span, we have no problem with it.

אמר רב פפא: לא אמרן אלא דלא אישתי שיכרא, אבל אישתי שיכרא לית לן בה.

Rav Pappa said: We only stated this concern about eating onion leaves in a case where one did not drink beer afterward; however, if he drank beer afterward, we have no problem with it.

תנו רבנן: לא יאכל אדם בצל, מפני נחש שבו. ומעשה ברבי חנינא שאכל חצי בצל וחצי נחש שבו וחלה ונטה למות, ובקשו חביריו רחמים עליו וחיה, מפני שהשעה צריכה לו.

A baraita states: A person should not eat onion because of the toxins in it. There was an incident with R' Ḥanina, who ate half an onion and half of its toxins, and he fell deathly ill, and his colleagues prayed for mercy for him, and he survived. He was rescued only because the time needed him, as his generation was in need of his teaching, but otherwise he would not have recovered.

אמר רבי זירא אמר שמואל: שכר מערבין בו, ופוסל את המקוה בשלשת לוגין. מתקיף לה רב כהנא: פשיטא, וכי מה בין זה למי צבע? דתנן: רבי יוסי אומר: מי צבע פוסלין את המקוה בשלשת לוגין. אמרי: התם מיא דצבעא מיקרי, הכא שיכרא איקרי.

R' Zeira said that Shmuel said: One may establish an eiruv with beer, and it invalidates a mikveh with a measure of 3 log, similar to drawn water. Rav Kahana strongly objects to this: This is obvious, for what is the difference between this and dye-water? As we learned in a Mishnah that R' Yosei says: Dye-water invalidates a mikveh with a measure of 3 log, like regular drawn water. They said: There is a difference between the two cases, as there, the liquid is called dye-water; here, it is called beer. Therefore, it might have been possible to argue that beer is not considered like water at all, in which case it would only invalidate a mikveh if it changed the color of the water, and so Shmuel’s novel teaching was necessary.