1ערות אחות אמך לא תגלה - שלא לבוא על אחות אם, שנאמר (ויקרא יח יג) ערות אחות אמך לא תגלה וגו'. כל ענינה, כמו אחות אב (מצוה קצז).
The nakedness of the sister of your mother you shall not reveal: To not have intercourse with the sister of the mother, as it is stated (Leviticus 18:13), “The nakedness of the sister of your mother you shall not reveal, etc.” All of its content is like the sister of the father (Sefer HaChinukh 197).
Hebrew: the classic text (Torat Emet transcription). English: Rabbi Francis Nataf, Sefaria 2018 (CC0). Via Sefaria. Learning for halacha? Please ask your Rav. All the library · Jer’s Torah Page