English of Core Text: Rav Nachman bar Yitzchak said: concerning milah it is written “sign, covenant, generations,” and concerning Shabbat it is written “sign, covenant, generations” — from here, milah overrides Shabbat.
On the daf / in context: The shared vocabulary creates a gezerah-shavah-style linkage that privileges the timely performance of milah even on Shabbat.
Type of Learning
Gezerah shavah / Custom
What Is Learned
The identical covenantal language of milah and Shabbat is the classic source for milah’s priority on the eighth day even when it falls on Shabbat.