Sefer HaMitzvot, Negative Commandments
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הזהיר שאר האנשים שלא לבא על היבמה והיא תחת זיקת יבמה. והוא אמרו לא תהיה אשת המת החוצה לאיש זר. והעובר על לאו זה לוקה. והתבארו משפטי מצוה זו ביבמות. (שם, שם):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited other men from having sexual intercourse with a levirate wife when she is tied to the bond of her levirate husband. And that is His saying, "the wife of the deceased shall not be married to a stranger, outside" (Deuteronomy 25:5). And one who transgresses this negative commandment is lashed; and the regulations of this commandment have been explained in Yevamot. (See Parashat Ki Tetzeh; Mishneh Torah, Divorce 9.)