It is the duty of Christians to welcome and embrace refugees and immigrants regardless of where they’re from and what faith they hold. This is made clear throughout the Bible.
The Old Testament is full of exhortations to the faithful to treat foreigners and refugees with the same justice and compassion we would want for ourselves.
In Exodus, God commands the Hebrews not to mistreat or oppress foreigners:
“Do not mistreat or oppress a foreigner, for you were foreigners in Egypt.
“Do not take advantage of the widow or the fatherless. If you do and they cry out to me, I will certainly hear their cry. My anger will be aroused, and I will kill you with the sword; your wives will become widows and your children fatherless. (Exodus 22:21-24)
This point is also made in Leviticus:
When a foreigner resides among you in your land, do not mistreat them. The foreigner residing among you must be treated as your native-born. Love them as yourself, for you were foreigners in Egypt. I am the Lord your God. (Leviticus 19:33-34)
Deuteronomy tells us that God loves the foreigners who reside among his faithful, providing for their material comfort, and that the truly faithful are to love foreigners as He does:
Circumcise your hearts, therefore, and do not be stiff-necked any longer. For the Lord your God is God of gods and Lord of lords, the great God, mighty and awesome, who shows no partiality and accepts no bribes. He defends the cause of the fatherless and the widow, and loves the foreigner residing among you, giving them food and clothing. And you are to love those who are foreigners, for you yourselves were foreigners in Egypt. (Deuteronomy 10:16-19)
Deuteronomy reiterates this point by cursing those who ignore the Lord’s command:
“Cursed is anyone who withholds justice from the foreigner, the fatherless or the widow.”
Then all the people shall say, “Amen!” (Deuteronomy 27:19)
The books of the prophets continue to reiterate this central duty of those who worship God.
In Jeremiah, the we are warned against empty religion that does not fulfill the Lord’s teachings:
Hear the word of the Lord, all you people of Judah who come through these gates to worship the Lord. This is what the Lord Almighty, the God of Israel, says: Reform your ways and your actions, and I will let you live in this place. Do not trust in deceptive words and say, “This is the temple of the Lord, the temple of the Lord, the temple of the Lord!” If you really change your ways and your actions and deal with each other justly, if you do not oppress the foreigner, the fatherless or the widow and do not shed innocent blood in this place, and if you do not follow other gods to your own harm, then I will let you live in this place, in the land I gave your ancestors for ever and ever. (Jeremiah 7:1-7)
Zechariah also condemns oppression of foreigners:
And the word of the Lord came again to Zechariah: “This is what the Lord Almighty said: ‘Administer true justice; show mercy and compassion to one another. Do not oppress the widow or the fatherless, the foreigner or the poor. Do not plot evil against each other.’ (Zechariah 7:8-10)
Malachi warns that the Lord will put on trial those who deprive foreigners of justice:
“So I will come to put you on trial. I will be quick to testify against sorcerers, adulterers and perjurers, against those who defraud laborers of their wages, who oppress the widows and the fatherless, and deprive the foreigners among you of justice, but do not fear me,” says the Lord Almighty.
“I the Lord do not change. So you, the descendants of Jacob, are not destroyed. Ever since the time of your ancestors you have turned away from my decrees and have not kept them. Return to me, and I will return to you,” says the Lord Almighty. (Malachi 3:5-7)
The New Testament continues this theme. In Matthew we are shown that Christ Himself and His holy parents were themselves refugees in the time of Herod:
When they had gone, an angel of the Lord appeared to Joseph in a dream. “Get up,” he said, “take the child and his mother and escape to Egypt. Stay there until I tell you, for Herod is going to search for the child to kill him.”
So he got up, took the child and his mother during the night and left for Egypt, where he stayed until the death of Herod. And so was fulfilled what the Lord had said through the prophet: “Out of Egypt I called my son.”
When Herod realized that he had been outwitted by the Magi, he was furious, and he gave orders to kill all the boys in Bethlehem and its vicinity who were two years old and under, in accordance with the time he had learned from the Magi. (Matthew 2:13-16)
And in His parable of the sheep and the goats, Christ makes clear the gravity of treating those in need, which certainly includes refugees, with a hard heart:
For I was hungry and you gave me something to eat, I was thirsty and you gave me something to drink, I was a stranger and you invited me in, I needed clothes and you clothed me, I was sick and you looked after me, I was in prison and you came to visit me.’
“Then the righteous will answer him, ‘Lord, when did we see you hungry and feed you, or thirsty and give you something to drink? When did we see you a stranger and invite you in, or needing clothes and clothe you? 39 When did we see you sick or in prison and go to visit you?’
“The King will reply, ‘Truly I tell you, whatever you did for one of the least of these brothers and sisters of mine, you did for me.’ (Matthew 25:35-40)
Upon those who live their faith through practical compassion He will bestow heavenly rewards, but those who turn away strangers Christ will likewise turn away.
Paul too speaks about the importance of welcoming strangers with open arms. In Hebrews, Paul exhorts us to show hospitality to strangers and to remember those, like refugees, who suffer:
Do not forget to show hospitality to strangers, for by so doing some people have shown hospitality to angels without knowing it. Continue to remember those in prison as if you were together with them in prison, and those who are mistreated as if you yourselves were suffering. (Hebrews 13:2-3)
All this is reflected in Christianity’s central moral precept that we are to love our neighbors as ourselves (Leviticus 19:18, Matthew 19:19, Matthew 22:39, Luke 10:27). “For the entire law is fulfilled in keeping this one command: ‘Love your neighbor as yourself’,” as Paul teaches in Galatians 5:14, “for he who loves his neighbor has fulfilled the Law” (Romans 13:8).
Those who do not exercise practical love for their neighbor, even their foreign neighbor, even their neighbor who lives beside them without a visa, have renounced Christ and His teachings. It is to them that Christ says “You that are accursed, depart from me into the eternal fire prepared for the devil and his angels” (Matthew 25:41).