"Be not forgetful to entertain strangers: for thereby some have entertained angels unawares." (Heb 13: 2)
In Mormon thought, there is no distinction between humans and angels. Angels are humans who have lived and are now glorified messengers of God, or else humans who have yet to live and fulfill specific missions on earth as part of their premortal existence.
Whenever we offer hospitality for another, then, we are always entertaining angels. Because of their mortal covering, though, how often do we do so unaware?
Thanks to Paul Bindel for making me think of this today.