Yevamot 64B

חצבתם ואל מקבת בור נקרתם״, וכתיב, ״הביטו אל אברהם אביכם ואל שרה תחוללכם״.

from where you were hewn, and to the hole of the pit from where you were dug” (Isaiah 51:1), and it is written in the next verse: “Look to Abraham your father and to Sarah who bore you” (Isaiah 51:2), which indicates that sexual organs were fashioned for them, signified by the words hewn and dug, over the course of time.

אמר רב נחמן אמר רבה בר אבוה: שרה אמנו אילונית היתה, שנאמר: ״ותהי שרי עקרה אין לה ולד״, אפילו בית ולד אין לה.

Rav Naḥman said that Rabba bar Avuh said: Our mother Sarah was initially a sexually underdeveloped woman [aylonit], as it is stated: “And Sarah was barren; she had no child” (Genesis 11:30). The superfluous words: “She had no child,” indicate that she did not have even a place, i.e., a womb, for a child.

אמר רב יהודה בריה דרב שמואל בר שילת משמיה דרב: לא שנו אלא בדורות הראשונים, ששנותיהן מרובות. אבל בדורות האחרונים, ששנותיהן מועטות ⁠— שתי שנים ומחצה, כנגד שלשה עיבורים. רבה אמר רב נחמן: שלש שנים, כנגד שלש פקידות. דאמר מר: בראש השנה נפקדו שרה רחל וחנה.

Rav Yehuda, son of Rav Shmuel bar Sheilat, said in the name of Rav: They taught that he waits 10 years only with regard to the people who lived in former generations, whose years were numerous, i.e., they lived longer. However, with regard to the people who live in later generations, whose years are few, he waits only two and half years before divorcing her, corresponding to the time period of 3 pregnancies. Rabba said in the name of Rav Naḥman: He waits 3 years, corresponding to the 3 remembrances of barren women by God, as the Master said: On Rosh HaShana Sarah, Rachel, and Hannah were remembered, i.e., God gave them children. Since God determines on Rosh HaShana whether barren women will conceive that year, one may remain married until 3 such opportunities have passed.