Reference for Bekhorot 94:16

אמר רבי שמעון יאסיניא אמר רבי שמעון בן לקיש

AND LIKEWISE A WOMAN WHO DID NOT WAIT THREE MONTHS AFTER HER HUSBAND'S DEATH etc. [The Mishnah says that] he is not a first-born inheritance, implying however that he takes his share as a plain son [i.e., a non first-born].

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