What is the ruling on settling in lands of disbelief for the purpose of calling people to Allah?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: Some of the da'wah workers (those who call people to Allah) have traveled to lands of disbelief and settled there. When they are questioned about this, they say: The Muslims migrated to Abyssinia, which was a land of disbelief, and the Najashi protected them and defended them in that land. We are not being wronged there, and it is better than many lands of the Muslims. Is this statement acceptable?

Answer:
This depends on the circumstances. If the country they left from is one where they are being harassed in their religion and tested in their religion, and they find a country where they can manifest their religion and no one opposes them, then they migrate to it, even if it is a land of disbelievers, provided they are able to manifest their religion. Yes. The Najashi enabled the Muslims; he enabled them to call people to the faith, to the extent that he, may Allah have mercy on him, embraced Islam because of their calling him to it.