(Mishnah): How is the law of Dayah Shaitah? If she was sitting on a bed and dealing with Taharos, and she separated from them and saw blood, she is Teme'ah, the bed all of them are Tehorim.

Even though they said that she is Metamei 24 hours [retroactively], she counts [seven days of Nidah before immersing] only from the time that she saw blood.

R. Eliezer says, four types of women are Dayan Shaitan (because they are Mesulakos Damim, i.e. they normally do not see blood) -- a Besulah, a pregnant woman, a nursing woman, and a Zekenah (all of these will be explained).

R. Yehoshua: I heard only that a Besulah is Dayah Shaitah.

However, the Halachah follows R. Eliezer. (ELIYAHU RABAH - the Stam Mishnah says this, and not R. Yehoshua.)

(Gemara): R. Yehoshua said "I heard only that a Besulah is Dayah Shaitah."

However, the Halachah follows R. Eliezer.

[R. Eliezer, to Yehoshua]: We do not say that one who did not see the moon will come and testify. Rather, one who saw the moon will come and testify! You did not hear. I heard!

As long as R. Eliezer was alive, the Halachah followed R. Yehoshua. After R. Eliezer died, R. Yehoshua caused people to conduct like R. Eliezer.

Question: What is the case? If R. Eliezer heard from one [Chacham], and R. Yehoshua heard from two, both in his lifetime and after death, the Halachah should follow R. Yehoshua!

And if R. Yehoshua heard from one, and R. Eliezer heard from two, both in his lifetime and after death, the Halachah should follow R. Eliezer;

This is like it was taught, if one says "I heard from two" and two say "we heard from one", the one who heard from two has greater strength than the two who heard from one [and all the more so here that one heard from two and one heard from one]!

Answer: Rather, The case is, they are equal. He heard from one and he heard from one, or he heard from two and he heard from two;

In [R. Eliezer's] lifetime, [R. Yehoshua] did not agree with him. After death, he agreed with him.

Question: Why did he say [after death] that he agrees with him?

Answer: It is like it was taught - the four women that Chachamim said that Dayah Shaitan, their Kesamim are Tamei retroactively, except for a young girl before the [normal] time to see, for she has no stains. R. Meir says so;

And Chachamim say, the four women that Chachamim said that Dayah Shaitan, their Kesamim are Tamei retroactively, but a young girl who reached the time to see, her stain is like her sighting. Just like her sighting is Dayah Shaitah, also her Kesem is Dayah Shaitah.

R. Yanai says, [they needed to teach that a young girl who reached the time to see, her stain is Dayah Shaitah,] because her blood is common.

Inference: This [young girl who reached the time to see], that her blood is common, you say that she is Dayah Shaitah [for her sighting] - these [four women], whose blood is not common, all the more so [they are Dayah Shaitan for their sightings]! From here, R. Yehoshua agreed with R. Eliezer.