“Do not neglect to show hospitality to strangers, for by doing that some have entertained angels without knowing it,” is what Hebrews says. Angels. Like those who Abraham welcomed by the Oaks of Mamre, who said Sarah would have a child in her old age. If we’d just drop the self-serving rules we usually use to decide who we’ll let into our lives and who we’ll sit beside at the banquet, an angel might walk in and change everything.