Bava Batra 158B

גמ׳ בחזקת מי? רבי יוחנן אמר: בחזקת יורשי הבעל, ורבי אלעזר אמר: בחזקת יורשי האשה,

Talmud: The Mishnah teaches that according to Beit Hillel, the guaranteed property that the wife brought with her to the marriage retains its previous ownership status. The Talmud asks: In whose possession does the guaranteed property remain? R' Yoḥanan says: It remains in the possession of the husband’s heirs, since the husband is liable to compensate his wife for guaranteed property in the event of loss. And R' Elazar says: It remains in the possession of the wife’s heirs, as the property came from her father’s house and belongs to her.

ורבי שמעון בן לקיש משום בר קפרא אמר: יחלוקו. וכן תני בר קפרא: הואיל והללו באין לירש והללו באין לירש, יחלוקו.

And R' Shimon ben Lakish says in the name of bar Kappara: They divide the property between them. And likewise bar Kappara teaches in a baraita: Since these heirs come to inherit and those heirs come to inherit, and neither can prove his claim, they divide the property between them.

מתני׳ נפל הבית עליו ועל אמו, אלו ואלו מודין שיחלוקו. אמר רבי עקיבא: מודה אני בזו, שהנכסים בחזקתן. אמר לו בן עזאי: על [ה]חלוקין אנו מצטערין; אלא שבאת לחלק עלינו את השוין?!

Mishnah: If the house collapsed on a son and upon his mother, and it is unknown who died first, the following claims arise: The mother’s paternal family claims that the son died first, and therefore they inherit from the mother, and the son’s heirs claim that the mother died first and her son inherited from her, and therefore they inherit from the son. In this case, both these rabbis and those rabbis, Beit Shammai and Beit Hillel, concede that they divide the property between them. R' Akiva said: In this case I concede that the property retains its previous ownership status. Ben Azzai said to R' Akiva: We are already troubled by those cases where Beit Shammai and Beit Hillel are in disagreement. But do you come to bring upon us a disagreement with regard to the case where they agree?