Xenia
Etymology
Greek "xenia" was ritualized guest-friendship, protected by Zeus in his role as Zeus Xenios; violating it — as Paris did to his host Menelaus — could ignite wars. The root "xenos," stranger or guest, also gives "xenophobia" and "xenophile."
noun · /ZEN-ee-uh/
The ancient sacred duty of hospitality between host and guest, extended even to the stranger.
What it names
Hospitality raised to a binding moral and religious obligation, not a mere courtesy.
Example
The refugees were received with a kind of xenia their hosts felt as a sacred duty, not a favor.
Related idea
Hospitality turned into obligation; the same "xenos" that means welcome guest in hospitality curdles into fear in xenophobia.
See also