Yevamot 119A

האשה שהלך בעלה וצרתה למדינת הים, ובאו ואמרו לה: ״מת בעליך״⁠ — לא תנשא, ולא תתייבם עד שתדע שמא מעוברת היא צרתה.

Mishnah: In the case of a woman whose husband and rival wife traveled to a country overseas, and witnesses came and told her: Your husband died, she should not marry any other man, in case she requires levirate marriage with her brother-in-law, i.e., yavam, in which case she is prohibited from marrying anyone else. And she also should not enter into levirate marriage until she knows whether she, i.e., her rival wife, is pregnant. If her rival wife bears a child to her late husband, she does not have a levirate bond with her brother-in-law, and she is therefore prohibited from marrying him.

היתה לה חמות ⁠— אינה חוששת. יצתה מליאה ⁠— חוששת. רבי יהושע אומר: אינה חוששת.

If she had a mother-in-law overseas, but her late husband had no brothers, she need not be concerned that a brother to her husband may have been born. But if her mother-in-law departed from her town pregnant, this widow should be concerned that perhaps her late husband now has a brother, with whom she is obligated in levirate marriage. R' Yehoshua says: Even in such a case she need not be concerned and may marry whomever she wishes.

גמ׳ מאי ״היא צרתה״? הא קא משמע לן: להא צרה הוא דחיישינן, אבל לצרה אחריתי לא חיישינן.

Talmud: The Talmud asks: What is implied by the extra word: She, in the expression in the first clause of the Mishnah: Whether she, i.e., her rival wife, is pregnant? The Talmud answers that it teaches us this: We are concerned about a possible pregnancy of this rival wife who went overseas with her husband, but we are not concerned about the possibility that he married another rival wife overseas and sired a child by her.