'The guest is a god' — a Sanskrit precept placing hospitality toward a guest, expected or not, on the same footing as devotion to the divine.
रहन-सहन · Rahan-Sahan
Drawn from the Taittiriya Upanishad's instruction to treat one's mother, father, teacher, and guest each as a god, the phrase has become a standalone household principle: a guest, even unannounced, is traditionally offered food, water, and a seat before any question of convenience is raised.
The precept has also been adopted as India's national tourism slogan, but its household form predates that entirely, visible in the simple expectation, still widely held, that no guest leaves a home without being offered something, however modest.