Sefer HaMitzvot, Negative Commandments
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הזהירנו מגלות ערות אחות אשתו בחיי אשתו. והוא אמרו ואשה אל אחותה לא תקח. והעובר על לאו זה בכרת אם הוא מזיד ובשוגג יקריב קרבן חטאת קבועה:
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited us from sexual intercourse with the sister of his wife during the lifetime of his wife. And that is His, may He be blessed, saying, "You shall not take a woman and her sister" (Leviticus 18:18). And one who transgresses this negative commandment is [punished] by excision if it was volitional. But [if] inadvertent, he must sacrifice a fixed sin-offering.