Sefer HaMitzvot, Negative Commandments
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הזהירנו מגלות ערות אחות האב. והוא אמרו יתברך ערות אחות אביך לא תגלה. והעובר על לאו זה במזיד חייב כרת, ובשוגג יביא חטאת קבועה:
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited us from sexual intercourse with a sister of the father. And that is His, may He be blessed, saying, "The nakedness of your father's sister you shall not uncover" (Leviticus 18:12). And one who transgresses this negative commandment volitionally is [punished] by excision. But [if] inadvertent, he must bring a fixed sin-offering.