We're not to hesitate to help or extend hospitality to strangers--for sometimes the strangers we're helping turn out to have been sent by God. We never know through whom God will speak to our lives, so we shouldn't ever turn down an opportunity to serve.
http://biblegateway.com/passage/?search=Hebrews%2013:2&version=NIV
Topics: Strangers, Stranger, Entertain Angels, Angels Unawares
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