English of Core Text: From where do we know that circumcision by a non-Jew is invalid? … as it is written “you shall keep My covenant… and your offspring after you” — and not a non-Jew.
On the daf / in context: The addressees of the command to keep the covenant are limited to Avraham and his seed, excluding a gentile as the agent of milah.
Type of Learning
Custom
What Is Learned
The identity of the circumciser is fixed by the covenant’s own wording.