'Guest's' in the Bible

Here are my virgin daughter and my guest's concubine. I will send them out and you can abuse them and do to them whatever you like. But don't do such a disgraceful thing to this man!"

But when the king came in to see the guests, he saw there a man who had not on a guest's robe;

And he says to him, Friend, how came you in here not having a guest's robe? And he had nothing to say.