1. There is a dispute about whether the Kohanim failed Chagai's test during the era of the second Beis ha'Mikdash.
2. The Gemara notes that there was another question that Chagai asked that the Kohanim answered correctly.
3. The Gemara discusses Chagai's statement that whatever the Kohanim offer is considered Tamei.
4. Rebbi Yehudah discusses the Tum'ah of liquids that causes vessels to become Tamei.
5. Ravina insists that Rebbi Yehudah maintains that the Tum'ah of liquids is a Torah law in limited cases.
A BIT MORE
1. Rav says that they failed. Chagai asked them whether a Revi'i b'Kodesh is Tamei or not, and they said that it is Tahor. Shmuel says that they did not fail, since Chagai in fact asked them whether a Chamishi b'Kodesh is Tamei, and it indeed is Tahor.
2. According to Rav, only this question was answered correctly. According to Shmuel, both questions were answered correctly.
3. According to Rav, this is because they indeed answered one of the questions incorrectly. According to Shmuel, this was a prophecy that there will come a time when they will sin and have impure actions.
4. While the Gemara's original assumption is that he maintains that this is a Torah law, the Gemara understands that Rebbi Yehudah retracted this position.
5. However, the Gemara concludes that Ravina's position is incorrect.