English: From the fact that it says “Machalat daughter of Yishmael” do I not already know that she is the sister of Nevayot? Why then does it say “sister of Nevayot”? This teaches that Yishmael betrothed her and then died, and Nevayot her brother gave her in marriage.
On the daf / in context: The extra phrase “sister of Nevayot” is taken to indicate that the marriage was completed by the brother after the father’s death, establishing a legal detail about who may give a woman in marriage.
Type of Learning
Custom (halakhic midrash — brother completes the marriage after father’s death)
What Is Learned
Yishmael betrothed Machalat and then died; his brother Nevayot completed the marriage. The superfluous “sister of Nevayot” is the source of that detail.