Shammai says: [Regarding] all women their times [of discovering a discharge of blood] suffice for them. Hillel says: [They are considered tamei] from [the time of their last] examination to [the time of their present] examination, even for many days. But the Sages say: [The law is] neither in accordance with the words of this one nor in accordance with the words of that one; rather, “twenty-four hours” reduces [the time of] “from examination to examination,” and “from examination to examina-tion” reduces [the time of] “twenty-four hours.”  [For] any woman who has a [fixed] period, her time suffices for her.  And one who [examines herself] with examination cloths when she engages in marital relations, this [examination] is the equivalent of a [regular] examination, and reduces the [time of] “twenty-four hours” and [the time of] “from examination to examination.”

What is [an example of the law that] her time suffices for her? [If a woman] had been sitting on a bed and handling tohoros, and she left [the bed] and discovered [a discharge of uterine blood], she is tamei but they all are tahor.  Even though [the Sages] said [that] she conveys tumah [retroactively] for twenty-four hours, she begins counting only from the time that she sees [the discharge].

7. All foods can combine to make up the amount of half a pras that disqualifies a person. All liquids can combine to make up the amount of a reviis that disqualifies a person. This is a stringency in the case of drinking tamei liquids over the case of a mikveh: [viz.] they made other liquids the same as water.

8. [If] one ate tamei foods or drank tamei liquids and [then] immersed himself [and then] vomited them up, they remain tamei, because they do not become purified in the body. [But if] he drank tamei water and [then] immersed himself and [then] vomited it up, it is tahor, because it can become purified in the body. [If] one swallowed a ring that is tahor, and he entered a tent [containing] a corpse, and [then] he had himself sprinkled upon, and [the sprinkling] repeated, and he immersed himself and then he vomited it up, it is as it was before. [If] one swallowed a ring that is tamei, he can immerse himself and eat terumah; [if] he vomits it up, it is [still] tamei and it renders him tamei. [If] an arrow is stuck into a person, when it is visible it intervenes. If it is not visible, he may immerse himself and eat terumah.