Answer:
I would say that the excerpt from The Odyssey that demonstrate the importance of hospitality in Greek society is this one at the beginning: "<em>Here is a poor man come, a wanderer, driven by want to beg his bread, and everyone in hall gave bits, to cram his bag-only Antinous threw a stool, and banged his shoulder</em>".
Explanation:
These lines show how people in Greek society react when they see a poor man, they share what they have, they try to help him. This is very clear in the excerpt when the speaker says: "<em>everyone in hall gave bits, to cram his bag</em>". People seem to care about this "<em>wanderer</em>", they have a solidary attitude towards him.