Yerushalmi Shevuot 2:4 ירושלמי שבועות ב׳:ד׳

MISHNAH: What is the positive commandment about the menstruating woman⁷⁹For which the High Court has to bring a purification sacrifice if they rule wrongly, Horaiot Mishnah 2:4.? If he was having sex with a pure one and she said to him, I became impure, if he separates immediately he is liable,⁸⁰For extirpation if he acts intentionally, for a sacrifice if unintentionally. for his separation is as pleasurable to him as his entry⁸¹He has to stay immobile until his erection subsides; Horaiot2:5 Note 69..

HALAKHAH: “What is the positive commandment about the menstruating woman,” etc. ⁸²This paragraph does not belong here; it is copied from Horaiot2:5 (Notes 60–63) and refers to the statement of the Mishnah there that the High Court never incurs the liability for a purification sacrifice for a wrong decision about the purity of the Sanctuary. It is explained that a purification sacrifice is due only for wrong rulings in matters that require fixed value purification sacrifices, not matters of the Sanctuary which trigger obligations of variable value sacrifices. Cahana said, is it impossible that there was knowledge at the beginning and knowledge at the end and oblivion in between? Rebbi Samuel ben Eudaimon objected before Rebbi Mana: Could that be for the teachers? He told him, we have a problem with those entering and you bring us teachers? What about it? Rebbi Samuel bar Rav Isaac said, commandments, commandments. Since commandments mentioned there are about fixed-value [offerings], here also about fixed-value [offerings].