Niddah 1:6 - 1:7

ובמה אמרו – that four women [fall into the category of those for whom the] time [of first seeing blood] suffices (see Mishnah 3).

בראיה ראשונה - that she saw it (i.e., blood) as a virgin, and the pregnant woman [once it is known that the fetus is present] and the nursing mother [when her son is weaned], and the old woman after three periods have gone by for her on account of her old age.

אבל בשניה מטמאה מעת לעת – that she has returned to her previous condition that her blood would be found in her.

מאונס – as for example that she got excited and saw it (i.e., blood) or on account of fear, or that she consumed something which stirs up the blood.

אע"פ שאמרו – a woman who has regular premonitory symptoms of menstruation sufficient for her is time.

צריכה להיות בודקת – on every day in the morning and in the evening like the other women.

חוץ מן הנדה – from when she saw it (i.e., blood) on day, she is unclean for seven days and does not need an examination all seven [days], for without an attack she is unclean all seven [days].

והיושבת על דם טוהר – for why should there be an examination for her, for even if she would sight it (i.e., blood), it is h blood of purity (i.e., vaginal bleeding experienced by a woman from eight to forty days after giving birth to a boy and from fifteen to eighty days after giving birth to a girl. This blood does not render a woman ritually impure, according to the Torah, even though current Halakhic practice renders a woman ritually impure).

ומשמשת בעדים – even though she has premonitory symptoms of menstruation , she needs to examine [herself] before sexual intercourse and after sexual intercourse [with her husband]. And especially if she was engaged with [ritual] purity, for since requires examination for [ritual] purity, she requires examination also for her husband. But a woman who is not engaged with [ritual] purity, for her husband she does not require examination.

ובתולה שדמיה טהורים – four nights according to the School of Shammai, but according to the School of Hillel until the wound of sexual intercourse should heal, and she does not have to use pieces of cloth (literally, “witnesses”), for her blood is pure, and if the appearance of her blood has changed, for since she engaged in sexual intercourse, for on account of sexual intercourse, it changed, but in the morning and in the evening , she requires examination where she didn’t engage in sexual intercourse after the first coition, lest the appearance of her blood changed from her first coition. But if her blood changed in appearance, she is impure/unclean, for we are accustomed to speak where this is not the blood of a virgin.

שחרית ובין השמשות – in the morning to pronounce fit/kosher the purities of the night, that if she would find herself to be pure, she would know that she didn’t see it (i.e., blood) in the night, and when she minds in the evening that she is impure/unclean, these leave the realm of doubt, and similarly at twilight to pronounce fit/kosher the purities that she was engaged in during the daytime.

ובשעה שהיא עוברת לשמש את ביתה - when she prepares herself to engage in sexual relations with her husband.

רבי יהודה אומר אף בשעת עברתן מלאכול מתרומה – even after they have consumed heave-offering/the priest’s due (i.e., if her husband is a Kohen), she needs to examine herself, to repair the remnants of heave-offerings that are before her that if she finds now as [ritually] pure., when she examines in the evening according to her appropriate manner and she finds that she is impure, there will not be remnants of the heave-offering at all that were retroactively impure, for she examined herself after finishing. But the Halakha is not according to Rabbi Yehuda.