Some say that a change of place tears up a person’s decree, as it is said: “Hashem said to Avram, Go forth from your land…” and afterward “I will make you a great nation.”
On the daf / in context: The sugya discusses four things that tear up a decree (or postpone it). Change of place is one; the verse of Lech Lecha is the proof-text because the promise of nationhood follows the command to leave.
Type of Learning
Custom
What Is Learned
Leaving one’s place is not only a geographic act; Chazal treat it as capable of altering a heavenly decree, as seen in Avram’s journey.