question #1 Sahih al-Bukhari 2635, Book 51, Hadith 67 : What is the significance of migration in the story of Prophet Abraham and Sarah?

Allah’s Messenger (ﷺ) said, “The Prophet (ﷺ) Abraham migrated with Sarah. The people (of the town where they
migrated) gave her Ajar (i.e. Hajar). Sarah returned and said to Abraham, “Do you know that Allah
has humiliated that pagan and he has given a slave-girl for my service?”