Yoma 42A

של פרה ⁠— משקל עשרה זוז, ושל שעיר המשתלח ⁠— משקל שני סלעים, ושל מצורע ⁠— משקל שקל.

The strip of crimson of the red heifer has the weight of 10 zuz; and the strip of the scapegoat has the weight of two sela, which is 8 zuz; and the strip of the metzora has the weight of a shekel, which is two zuz.

אמר רבי יוחנן: פליגי בה רבי שמעון בן חלפתא ורבנן בפרה, חד אמר: משקל עשרה, וחד אמר: משקל שקל. וסימניך: ״אחד המרבה ואחד הממעיט״.

And R' Yoḥanan further said: R' Shimon ben Ḥalafta and the Rabbis disagree with regard to the strip of crimson of the red heifer. One said: It has the weight of 10 zuz. And one said: It has the weight of one shekel. And your mnemonic for remembering that while both assume that only one of the extreme values was required no one suggests the middle value of two sela is required, is the aphorism from a Mishnah: God equally values both the one who gives much and the one who gives little as long as his intention is to Heaven.

אמר ליה רבי ירמיה מדיפתי לרבינא: לא בפרה פליגי, אלא בשעיר המשתלח פליגי. וההוא יומא נח נפשיה דרביא בר קיסי, ואנחו בה סימנא: רביא [בר] קיסי מכפר כשעיר המשתלח.

R' Yirmeya of Difti said to Ravina: It is not with regard to the strip of the red heifer that they disagree; rather, it is with regard to the strip of the scapegoat that they disagree. And on that very day that they disputed this issue, Ravya bar Kisi died, and they made a mnemonic out of it, associating the halakha with his name: The death of Ravya bar Kisi atones like the scapegoat, since the death of the righteous person atones for his generation.

אמר רבי יצחק: שתי שחיטות שמעתי, אחת של פרה, ואחת של פרו. אחת כשרה בזר, ואחת פסולה בזר, ולא ידענא הי מינייהו.

R' Yitzḥak said: I heard a teaching that there is a distinction between two slaughters: One of the red heifer, and one of the bull of the High Priest on Yom Kippur. The slaughter of one of them is valid even if done by a non-priest, and the slaughter of the other one is invalid if done by a non-priest. But I do not know which of them is which.