(Mishnah): If one was Metamei [another's Taharos], Medame'a (mixed Chulin with Terumah, which forbids it to Zarim), or was Menasech (this connotes pouring libations to idolatry; this is discussed below) b'Shogeg, he is exempt. If he was Mezid, he must pay.

If Kohanim were Mefagel (disqualified a Korban through intent to eat or offer some of it outside the allowed time or place) in the Mikdash b'Mezid, they are liable [to pay for it].

(Gemara): R. Yudan did not go to the Beis Midrash. He encountered R. Mana, and asked what Chidush was said [there];

R. Mana: R. Yosi said, one who is Metamei is not like one who does an action.

R. Yudan: Do we not learn this from a Mishnah? [If one stole] Terumah, and it became Tamei [He returns it. If Metamei were like one who does an action, he should need to pay for Tahor Terumah!]

Rebuttal (R. Yosi): Perhaps [the Mishnah] discusses Terumah that became Tamei automatically, and you cannot learn from it anything [about whether or not Metamei is like an action]!

(R. Yosi): Rather, we learn from this Mishnah. If one judged a case and vindicated the one who is [truly] liable and obligated the Zakai, or he was Metamei what is Tahor and Metaher what is Tamei, [he is liable. We explained this like HAGAHOS R. DINAR];

(R. Yirmeyah citing Rav): The case is, he physically touched [Tum'ah to the Taharos] with his hand (to remove any doubt that they are Tahor. He is liable to pay. This shows that Metamei is like an action.)

(Shmuel): The case is, he physically touched with his hand.

(R. Yehudah b'Ribi R. Chiyah): According to letter of the law, even Shogeg should be liable. Why did they say that he is exempt? It is in order to that he will inform (that he was Metamei, and not refrain because he does not want to pay).

(R. Yochanan): According to letter of the law, even Mezid should be exempt (the Torah obligates only for visible damage). Why did they say that he is liable? It is a fine [to stop people from being Metamei others' Taharos].

R. Yochanan's opinion was inferred [from the following. He did not say so explicitly. Our Mishnah says that] if one was Metamei, Medame'a, or Menasech b'Shogeg, he is exempt. If he was Mezid, he must pay, and R. Yochanan said that it is a fine.

Support (for R. Yochanan - Beraisa): One who puts a yoke on another's Parah [Adumah, which disqualifies it,] is exempt bi'Ydei Adam and liable bi'Ydei Shamayim.