Romans 12:13

Given to hospitality— It was the more proper for the Apostles frequently to enforce this duty, as the want of public inns rendered it difficult for strangers to get accommodations; and as many Christians might be banished their native country for religion, and perhaps laid under a kind of excommunication, both among Jews and heathens; which would make it a high crime for any of their brethren to receive them into their houses. See Blackwall's Sacred Classics, vol. 1: p. 232.