Hebrews 13:2

2 Do not forget to show hospitality to strangers, for by so doing some people have shown hospitality to angels without knowing it.

Read Hebrews 13:2 Using Other Translations

Be not forgetful to entertain strangers: for thereby some have entertained angels unawares.
Do not neglect to show hospitality to strangers, for thereby some have entertained angels unawares.
Don’t forget to show hospitality to strangers, for some who have done this have entertained angels without realizing it!