Pesachim 21A

אין הכרעת שלישית מכרעת.

The decision of the third opinion of R' Yishmael, son of R' Yosei, is not considered a decision in this case, as the other two rabbis do not raise the issue of a stumbling block at all.

אמר רבי יוסי ברבי חנינא: מחלוקת שנפלה לפחות ממאה סאה חולין טמאין.

R' Yosei, son of R' Ḥanina, said: The dispute between R' Eliezer and R' Yehoshua with regard to a jug of teruma that broke in an upper press and was flowing down into the lower press applies only to a case where one se’a of teruma fell into less than 100 se’a of impure, non-sacred wine in the lower press.

אבל נפלה למאה חולין טמאין ⁠— דברי הכל תרד ותטמא, ואל יטמאנה ביד.

However, if the teruma wine fell into 100 se’a of ritually impure, non-sacred produce, everyone agrees that the wine should be allowed to descend and become ritually impure by itself, and one should not actively render it impure with his hand. The reason is that if teruma falls into non-sacred produce 100 times greater in quantity than itself, the teruma is nullified by the non-sacred produce, and therefore, it would be permitted for a non-priest to eat it. Although it becomes ritually impure, the legal status of the nullified teruma is that of non-sacred produce.

תניא נמי הכי: חבית שנשברה בגת העליונה, ותחתיה מאה חולין טמאין ⁠— מודה רבי אליעזר לרבי יהושע שאם יכול להציל ממנה רביעית בטהרה ⁠— יציל, ואם לאו ⁠— תרד ותטמא ואל יטמאנה ביד.

The Talmud comments: That was also taught in a baraita: With regard to a jug of teruma wine that broke in the upper winepress, and in the lower press there is 100 times that amount of ritually impure, non-sacred wine, R' Eliezer concedes to R' Yehoshua that if one is able to rescue even 1/4th-log from the jug that broke and keep the wine in a state of ritual purity, he should rescue it. And if not, one should let the teruma wine descend and become impure on its own, but he should not actively render it impure with his hand.