The Cow - 2:243
"Have you noticed those who left their homes for fear of death, though they numbered thousands? Allah said to them, "Die,"then He raised them up. Allah is gracious to mankind, but most of the people do not give thanks."
Believers should emigrate only if they have no power to resist oppression and persecution:
The Heights/7:88
"The arrogant elders of his people said: "Shu´ayb, either we will expel you and those who believe with you from our city or you will return to our religion."He said: "Even if we do not want to?"
Prophet Abraham/14:13
"The disbelievers said to their messengers, "Either you return to our religion or we will expel you from our land!"Their Lord revealed to them, "We will destroy the wrongdoers."
Mary/19:46
"(His father said:) "Are you turning away from my gods, Abraham? If you do not stop this, I will stone you, go away from me!"
Mary/19:47
"Peace be upon you,"he said, "I will beg my Lord for your forgiveness; He is most merciful to me."
The Banishment/59:8
Give first to the poor of the refugees who have been driven from their homes and their property because they sought the favor of Allah and His pleasure and supported Allah and His messenger. These are the righteous.
The Pilgrimage/22:40
"Those who were unjustly expelled from their land only because they said: "Our Lord is Allah". If Allah had not defended some of the people against others, the monasteries, churches, synagogues and masjids in which Allah´s Name is much mentioned would have been destroyed. Allah will surely help those who help Him. Allah is Mighty, Powerful,"
The Bee/16:110
Then your Lord is Forgiving and Merciful to those who emigrated after being oppressed, and strived and resisted; surely your Lord is Forgiving and Merciful to them.
The Bee/16:41
Those who emigrated for the cause of Allah after being oppressed, We will establish them well in this world. Greater is their reward in the Hereafter, if they only knew.
The Family Of Imran/3:195
"Their Lord answered them: "I will not leave unrewarded any of you who works, whether male or female; you are all equal. Those who emigrated, those who were expelled from their homes, those who were tortured and insulted in My way, those who fought and were killed... I will cover their evil deeds and place them in gardens with rivers flowing in them as a reward from Allah. The best reward is with Allah."