TT #83 · Parashas Vayeira · Passuk 21:8
And the child grew and was weaned, and Avraham made a great feast on the day that Yitzchak was weaned.
Torah Temimah points to Pesachim 119b. E-Daf · Sefaria — Pesachim 119b
TT lemma: ויגמל.
“And he was weaned.” Rav Avira expounded: What is the meaning of “And the child grew and was weaned”? The Holy One, blessed be He, will make a feast for the righteous on the day that He weans His kindness upon the seed of Yitzchak.
Derash on the verse (Bavli sugya) — not a formal named middah of the 13. A narrative celebration is projected onto the eschatological feast.
Avraham’s weaning feast foreshadows the future banquet that Hashem will make for the righteous when His kindness is fully “weaned” upon the seed of Yitzchak.