וכתבתם. כל פסוק זה נתבאר לפנינו לעיל בפ' ואתחנן (ו' ט').
English: “And you shall write them on the doorposts of your house” — this is the mitzvah of mezuzah. The house is obligated; gates and doorways are included in the classical derashot on which openings require a mezuzah.
On the daf / in context: Torah Temimah places this derasha on Devarim 11:20. The Core Text is the words of Chazal (as transmitted in the source named above).
Type of Learning
Custom (Bavli / Sifrei)
What Is Learned
Mezuzah turns the doorway into a place where the words are written and met each time one enters.