To entertain strangers. — Hospitality to Christian brethren at a distance from their homes is especially intended (1 Peter 4:9): this was one manifestation of the “love of the brethren” (Hebrews 13:1). The prominence assigned to this duty in the exhortations of the Epistles of the New Testament was faithfully reflected in the practice of the early Church.
Thereby some have entertained angels unawares. — See Genesis 18:19. The Greek word for “angels” — messengers — of itself would serve to remind these Christians that, though the strangers whom they welcomed were but men, they might be special messengers of God. Clement of Rome, in his Epistle to the Corinthians (A.D. 95), appeals to the same examples (and also to Rahab): “For his faith and hospitality a son was given to Abraham in his old age. For his hospitality and godliness Lot was saved from Sodom.”