(Mishnah): Kusi girls are considered to be Nidos from birth;

[Male] Kusim are Metamei a Mishkav below like one above, for they are Bo'alei Nidos;

Kusi women [are assumed to be Teme'os], for they sit (seven days of Nidah) due to blood of any color (so sometimes they immerse too early, which does not help).

One is not liable [a Korban] for entering the Mikdash, as we do not burn Terumah due to the (assumed) Tum'ah of Kusim, because it is a Safek.

(Gemara): Dam Nidah is dirty. Dam Besulim is not dirty. Dam Nidah is red. Dam Besulim is not red. Dam Nidah comes from the Makor. Dam Besulim is not from the Makor, rather, from the walls.

(Mishnah): (The Tzedukim kept the Mitzvos according to their mistaken understanding. They did not heed the Oral tradition.) If a Tzeduki's daughter acts like her father, she is considered like a Kusis. If she changes and adopts the ways of Yisraelim, she is considered a Yisraelis;

R. Yosi says, she is considered a Yisraelis unless we see that she acts like her father.

(Mishnah - Beis Shamai): Blood of a Nochris, and Dam Tohar of a Metzora'as are Tehorim;

Beis Hillel says, they are Teme'im like her spit and urine (i.e. when they are wet).

Beis Shamai says, if a Yoledes did not immerse, her Dam Tohar is Tamei like her spit and urine;

Beis Hillel says, it is Tamei wet or dry.

Beis Shamai agrees that if she was Yoledes b'Zov, it is Tamei wet or dry.

(Mishnah): If a woman sees blood b'Koshi (amidst labor pains), she is a Nidah (this will be explained);

R. Eliezer says, if a woman saw Dam Koshi for three consecutive days during the 11 days of Zivah, and had 24 hours respite before giving birth, she is Yoledes b'Zov;

R. Yehoshua says, the respite must be for a Halachic day (a night and the following day), e.g. Shabbos;

The respite must be from the pain, but not from the blood.

Question: How long before birth do we attribute blood to the birth?

Answer #1 (R. Meir): We do so even 40 or 50 days before.

Answer #2 (R. Yehudah): We do so only in her (last) month (of pregnancy).

Answer #3 (R. Yosi and R. Shimon): We do so only in the two weeks before the birth.

(Mishnah): If a woman saw blood amidst Koshi during (Yemei Tohar in) the 80 days after Yoledes Nekevah, all the blood is Tahor, until the birth;

R. Eliezer says, it is Teme'ah. (Rashi - this is whether it comes during the days of Nidah or Zivah. R. Menachem - it is only if it is during the days of Nidah.)

Chachamim: Normally, Dam Shofi (blood seen without pain) is more stringent than Dam Koshi (the former can cause Zivah). During Yemei Tohar, the Dam Shofi is Tahor, and all the more so Dam Koshi is Tahor!

R. Eliezer: Dayo (a Kal va'Chomer cannot teach more than what we learn from). Dam Koshi normally (i.e. not in Yemei Tohar) does not cause Zivah, but it causes Nidah, the same applies when it is seen during Dam Tohar.

(Mishnah): A woman is Muchzekes Tehorah during the 11 days of Zivah;

If she did not check herself, whether she forgot, was unable, or intentionally did not check, she is Tehorah;

If her Veses came and she did not check herself, she is Teme'ah;

R. Meir says, if she was hiding (from an invading army or bandits) and her Veses came and she did not check herself, she is Tehorah, for fear inhibits blood;

A Zav (during the days he must count), Zavah or Shomeres Yom k'Neged Yom is Muchzak to be Tamei.