Quoting%20commentary for Horayot 2:4

אֵין חַיָּבִין עַל עֲשֵׂה וְעַל לֹא תַעֲשֶׂה שֶׁבַּמִּקְדָּשׁ, וְאֵין מְבִיאִין אָשָׁם תָּלוּי עַל עֲשֵׂה וְעַל לֹא תַעֲשֶׂה שֶׁבַּמִּקְדָּשׁ. אֲבָל חַיָּבִין עַל עֲשֵׂה וְעַל לֹא תַעֲשֶׂה שֶׁבַּנִּדָּה, וּמְבִיאִין אָשָׁם תָּלוּי עַל עֲשֵׂה וְעַל לֹא תַעֲשֶׂה שֶׁבַּנִּדָּה. אֵיזוֹ הִיא מִצְוַת עֲשֵׂה שֶׁבַּנִּדָּה, פְּרֹשׁ מִן הַנִּדָּה. וּמִצְוַת לֹא תַעֲשֶׂה, לֹא תָבֹא אֶל הַנִּדָּה:

There is no liability (for a sin-offering) for a positive commandment and a negative commandment in the sanctuary. [If beth-din ruled and erred in the tumah of the sanctuary and its holy things they are not liable for a congregational offering. ("for a positive commandment"): as when one became tamei in the sanctuary, it being a mitzvah for him to leave by the short way, and he lingered and left by the long way, he incurs kareth. And if beth-din ruled for him to leave by the long way, they are not liable for an offering, for there is no sin-offering for this unwittingness; that is, if an individual transgressed this unwittingly and left by the long way, he is not liable for a sin-offering but for a sliding-scale offering. ("and a negative commandment":) not to enter the sanctuary in a state of tumah.] And a suspended guilt-offering is not brought for a positive commandment and a negative commandment in the sanctuary. [For, everything whose unwitting transgression requires a fixed sin-offering, requires for his unknowingness a suspended gilt-offering, and sanctuary uncleanliness, since its unwitting transgression does not require a sin-offering, his unknowingness does not require a suspended guilt-offering.] But there is liability for a positive commandment and a negative commandment in niddah [("for a positive commandment":) If a man were living with a clean woman, and she said to him "I have become unclean," now at the time of cohabitation, it is a mitzvah for him to separate. But he is not to separate immediately, for such separation is as pleasurable to him as cohabitation. But "he sticks his nails in the ground" and waits until the organ has "died" and separates without hardness. This is the "positive commandment" of niddah. And if beth-din erred in this ruling and ruled that he separate immediately, they are required to bring a bullock of forgetfulness, because an individual is required to bring a sin-offering for unwittingness.] Which is the positive commandment in niddah? Separate from the niddah. And which is the negative commandment? Do not cohabit with a niddah.

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