New Defender's Study Bible Notes
13:2 entertained angels unawares. Angels have the ability to assume the appearance of men. Notice the angels who ate with Abraham and later with Lot (Genesis 18:2; 19:1-3). On entertaining strangers, see Leviticus 19:34; Matthew 25:35-45. It may even be that the “angels” of the seven churches (Revelation 1:20) appear to be human members or visitors of the churches. In any case, the admonition of this verse should be taken seriously.