Study Niddah folio 57B with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
Mishnah: A woman who sees a blood stain on her flesh adjacent to her vagina [beit haturpa], i.e., a place where blood that originated in her vagina could be found, becomes ritually impure, as there is a concern that it originated in the uterus and is menstrual blood. And if it was discovered on h
In a case where the stain was discovered on her leg or on her feet, if it was on the inner side she is ritually impure, as blood from the uterus could have reached there. If it was on the outer side she is ritually pure, and if it was on the sides, either from here, i.e., on the front of her leg
In a case where the woman saw a blood stain on her robe, if it was from the belt and below she is ritually impure, as blood from the uterus could have reached there; if it was from the belt and above she is ritually pure. In a case where she saw the stain on the end of the sleeve of the robe, if
If it was a robe which she would remove and with which she would cover herself at night, wherever on the robe that the stain is found, the stain renders her ritually impure, due to the fact that the robe moves while the woman is asleep and therefore the blood could have originated in the uterus. An
Talmud: With regard to the cases discussed in the Mishnah concerning a blood stain found on a woman, Shmuel says: If a woman examined the ground beneath her to see if it was clean from blood and other substances, and she found nothing, and subsequently she sat upon it and then found blood on it,