Sotah 26A

מעוברת חבירו ומינקת חבירו ⁠— לא שותות ולא נוטלות כתובה, דברי רבי מאיר.

The baraita continues: A woman who was pregnant with the child of another man at the time of her marriage and a woman who was nursing the child of another man at the time of her marriage neither drink the bitter water nor collect payment of their marriage contracts, as their marriages were prohibited by rabbinic law. This is the statement of R' Meir.

שהיה רבי מאיר אומר: לא ישא אדם מעוברת חבירו ומינקת חבירו, ואם נשא ⁠— יוציא ולא יחזיר עולמית. וחכמים אומרים: יוציא, וכשיגיע זמנו לכנוס ⁠— יכנוס.

The baraita continues: The reason for this is as R' Meir would say: A man may not marry a woman who is pregnant with the child of another man or a woman who is nursing the child of another man, until 24 months pass after the baby’s birth, so as to ensure that the woman will not become pregnant while the child needs to nurse. And if he married her, he must divorce her and may never remarry her, as the rabbis penalized him for transgressing the prohibition. And the Rabbis say: He must divorce her, and when his time to marry her arrives, i.e., 24 months after the baby’s birth, he can marry her again.

והרובא שנשא עקרה וזקינה, ואין לו אשה ובנים מעיקרא ⁠— לא שותה ולא נוטלת כתובה. רבי אלעזר אומר: יכול הוא לישא אחרת ולפרות ולרבות הימנה.

The baraita continues: In the case of a young man who married a barren woman or an elderly woman, and he did not have a wife and children beforehand, the woman neither drinks nor collects payment of her marriage contract, as it is prohibited for him to marry a woman with whom he cannot procreate. R' Elazar says: This marriage is not forbidden, as he can marry another woman and procreate through her, and therefore she can drink the bitter water.