English: “You shall seek His dwelling” — The Sages taught: We intercalate the years only in Yehudah, as it is stated “you shall seek His dwelling and come there” — every inquiry that you make shall be only in the dwelling-place of the Omnipresent.
On the daf / in context: The centralization of the Divine Presence requires that the calculation of the calendar also be performed in Yehudah (the region of the Temple).
Type of Learning
Derash on the verse (Sifrei / Bavli) — restricting intercalation to Yehudah.
What Is Learned
The Sanhedrin may intercalate the year only while located in Yehudah.