This was a striking feature of oriental life, as seen practised by Abraham in Genesis 18:2-8 , and it continues in these days to a partial extent. It is enforced in the N.T. as a duty among Christians. Romans 12:13; 1 Timothy 3:2; Titus 1:8; 1 Peter 4:9 . The fact is mentioned that by exercising hospitality "some have entertained angels unawares." Hebrews 13:2 .