Let mutual love continue. Do not neglect to show hospitality to strangers,
for by doing so some have entertained angels without knowing it.

Hebrews 13: 1–2


Biblical sources:

Who is my neighbour? Luke 10 25–37
How to treat a foreigner Leviticus 19 33–34
How foreigners can be a blessing The book of Ruth
Justice love and fellowship Micah 6: 8
Treating others as we treat the Lord Matthew 25: 31–46
The gift of hospitality Hebrews 13: 2
Breaking down barriers Ephesians 2: 11–22
For full texts see: http://www.biblegateway.com/