“She had no child” — Rav Nachman said: Sarah our mother was an aylonit, as it is said “she had no child” — she did not even have a womb.
On the daf / in context: Yevamos examines the Torah’s unusually emphatic statement that Sarah had no child. Rav Nachman reads the wording as indicating that her barrenness was anatomical, making the later birth of Yitzchak a manifestation of extraordinary Divine intervention.
Type of Learning
Custom (diyuk from the doubled language of barrenness).
What Is Learned
The extra phrase indicates a structural absence (aylonit); her later childbirth was miraculous and not a source for ordinary medical conclusions.