Acts 7:6 NASB - 6 "But God spoke to this effect, that his DESCENDANTS WOULD BE ALIENS IN A FOREIGN LAND, AND THAT THEY WOULD BE ENSLAVED AND MISTREATED FOR FOUR HUNDRED YEARS.All Christians, be they of Jewish or Gentile background are living in a "foreign land" if their true citizenship is in heaven.
When the term is used in Hebrews 11:13, it says the people of faith were aliens and strangers on earth. They weren't strangers merely because they had moved from one place on earth to another. They were strangers on earth, simply because they were on earth, and not in heaven.
The writer makes this plain in vs. 16.
"Instead, they were longing for a better country - a heavenly one. Therefore God is not ashamed to be called their God, for he has prepared a city for them."
Ephesians 2:19 NASB - 19 So then you are no longer strangers and aliens, but you are fellow citizens with the saints, and are of God's household,
1 Peter 1:1 NASB - 1 Peter, an apostle of Jesus Christ, To those who reside as aliens, scattered throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia, who are chosen
1 Peter 2:11 NASB - 11 Beloved, I urge you as aliens and strangers to abstain from fleshly lusts which wage war against the soul.