Rav Shlomo Zalman Auerbach: Inviting Strange Shabbos Guest?
What happens if there is a noticeably strange person who has no place to eat, must you invite him to your house for Shabbos meals? After all Avrohom Avinu's doors were open to all without regard to the consequences and danger. What should one do in such a situation?
Rav Shlomo Zalman was asked this question and answered that you are not obligated to invite this person for all Shabbos meals. It is enough to make sure he has bread and some other food to eat. In general he says, a man must speak with his wife before inviting over guests.
What if you find someone in Shul that has no place to eat? Should you not invite him because you haven't spoken to your wife beforehand? Although Rav Shlomo Zalman did not disagree with the notion that it is not always possible to ask, he did reiterate that there is no obligation to host "strange people". (Aleihu Lo Yibol CM 11)
article taken from:http://www.revach.net/article.php?id=1586