Complete Passuk
בְּעֶ֙צֶם֙ הַיּ֣וֹם הַזֶּ֔ה נִמּ֖וֹל אַבְרָהָ֑ם וְיִשְׁמָעֵ֖אל בְּנֽוֹ׃
On that very day Avraham was circumcised, and Yishmael his son.
Chabad / Judaica Press
Source Citation
TT: “on that very day” — the same day he was commanded he circumcised (zerizin makdimin); midrash also reads midday.
Core Text
Core Text
בְּעֶצֶם הַיּוֹם הַזֶּה — בּוֹ בַּיּוֹם שֶׁצִּוָּהוּ מָל.
English of Core Text: “On that very day” — on the very day he was commanded, he circumcised.
On the daf / in context: The phrase marks immediate performance; the midrashic layer adds that it was done at the height of the day.
What Is Learned
Avraham’s milah was performed the same day the command was given.