1 John 3:16. Many knows how to say "I love you". But what is love?
Heb 13:2 Do not neglect to show hospitality to strangers, for thereby some have entertained angels unawares.
A verse commonly neglected. I note that this is not about treating just the poor, but mere strangers. Of course, I'm sure there's wisdom in judging of the character of the stranger. Though per Tong, the stranger being "dirty" isn't quite a criteria to take into account much for rejection.