Hebrews 13: 2: Be not forgetful to entertain strangers: for thereby some have entertained angels unawares.
Abraham (Genesis 18: 1 - 8) and Lot (Genesis 19: 1 3) are examples of men who entertained angels unawares. There is a blessing in showing hospitality and making guests welcome.
We need to be conscious of our conduct before all people, for the angels of God have come in a time of investigation to behold the condition and conduct of the people.
The fivefold ministry are earthly angels (men with a message) to the people. Brother Branham was the major angel for the seventh church age. The Bride is carrying a message too; She is an angel with the message of the seventh angel in her heart.
The heathen are unaware that they are entertaining angels when you stand before them. And you likewise need to be conscious that supernatural beings from Heaven can step into flesh to see if your every movement matches the Word.