Bukhari

Hadith Commentary:
That is, the virtue of migration (hijrah) no longer remains as it was before the conquest of Makkah. Some have said that its meaning is that migration to the Messenger of Allah (sallallahu alayhi wa sallam) is no longer applicable. This does not mean that the legislation (mashru‘iyyah) of migration has been abrogated, because migration (hijrah) from the land of disbelief (dar al-kufr) to the land of Islam (dar al-Islam) is obligatory (wajib) when there is fear of harm to one’s religion.
This ruling remains until the Day of Judgment, and in the narration of Isma‘ili, this is explicitly stated from Ibn ‘Umar (radi Allahu anhu).
Hafiz said: From the statement of ‘A’ishah (radi Allahu anha), it is derived that migration is obligatory from that country where the worship of Allah cannot be performed freely; otherwise, it is not obligatory. Mawardi said: If a Muslim can openly practice his religion in the land of war (dar al-harb), then its ruling will be like that of the land of Islam (dar al-Islam), and remaining there will be superior to migrating, because by staying there, there is hope that others may also enter Islam.
(Wahidi)