English: This teaches that Yaakov our father was born already circumcised.
On the daf / in context: The description “ish tam” (a complete/wholesome man) is linked to the status of being born circumcised, since Avraham was not called “tamim” until after his circumcision.
Type of Learning
Custom (Avot de-Rabbi Natan — Yaakov born circumcised)
What Is Learned
Yaakov was born already circumcised; the title “ish tam” alludes to that innate completeness.