Mishnayos Shevuos Perek 2 Mishnah 4
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שבועות פרק ב׳ משנה ד׳
And which is the positive mitzva with regard to a menstruating woman for which, as is taught in Horayot there, the Sanhedrin is liable to bring a bull offering for an erroneous ruling? If a man was engaging in intercourse with a ritually pure woman, and during the course of their act of intercourse she experienced menstrual bleeding and said to him: I have become impure, and unwittingly he immediately withdrew from her and did not wait until his penis became flaccid, he is liable to bring a sin-offering for engaging in intercourse with a menstruating woman, because his withdrawal from her is as pleasant to him as his entry. If the Sanhedrin mistakenly ruled that one may withdraw immediately, they bring a bull offering for their erroneous ruling.
וְאֵיזוֹ הִיא מִצְוַת עֲשֵׂה שֶׁבַּנִּדָּה שֶׁחַיָּבִין עָלֶיהָ, הָיָה מְשַׁמֵּשׁ עִם הַטְּהוֹרָה וְאָמְרָה לוֹ נִטְמֵאתִי, וּפֵרַשׁ מִיָּד, חַיָּב, מִפְּנֵי שֶׁיְּצִיאָתוֹ הֲנָאָה לוֹ כְּבִיאָתוֹ:
Bartenura
ואיזו הוא מצות עשה שבנדה. שדומה לזו שבמקדש, שאירע לו הטומאה משבא בהיתר לידי כניסה אם שגגו ב״ד בהוראה זו חייבים עליה פר העלם דבר:
היה משמש עם הטהורה. שנכנס בהיתר ואמרה לו נטמאתי עכשיו, ופירש מיד בקושי האבר, חייב. אלא יעמוד בלא דישה עד שימות האבר ויפרוש בלא קושי. וזהו העשה שבנדה:
ואיזו היא מצות עשה שבנדה – which is similar to that which in the Sanctuary, that defilement occurred to him when he came with legal permission to entrance [into the Temple], if the Jewish court erred in this teaching , they are liable for a bull for an unwitting communal sin (as a result of an erroneous Halakhic decision handed down by the Great Sanhedrin).
היה משמש עם הטהורה – that [his penis] entered [her vagina] with legal permission and she said to him: ‘I have become ritually defiled now,” and he removed it immediately while his limb was hard, he is liable. But rather, he should stand without coitus until the limb dies and he can remove it without difficulty, and this is the positive commandment regarding the menstruating woman.