TT #27 · Parashas Vayeira · Passuk 18:12
And Sarah laughed within herself, saying, “After I have withered, shall I have pleasure, and my lord is old?”
Torah Temimah points to Bava Metzia 87a. E-Daf · Sefaria — Bava Metzia 87a
TT lemma: אחרי בלותי.
“After I have withered…” Rav Chisda said: “After I have withered, shall I have pleasure”—after the flesh had withered and the wrinkles had multiplied, the flesh was rejuvenated, the wrinkles smoothed out, and beauty returned to its place.
Derash on the verse (Bavli sugya) — not a formal named middah of the 13. The words are taken to describe an actual physical rejuvenation.
Sarah’s body was restored to youthful beauty after the announcement: the withered flesh was renewed and the wrinkles disappeared.