Katha 1.1.8
The brahmin who remains in a house unwelcomed causes the householder's hopes, expectations, pious deeds, cattle, and children to be destroyed.
A modern interpretation of this verse might be "one attracts misfortune by allowing an esteemed guest to remain in their home unwelcomed".
Adi Shankaracharya and a legacy of commenters have opined on the specific merit that one loses by improperly receiving a Brahmin in their home. These types of rigid formalities within a strictly defined class system can be found in hierarchies throughout the world and throughout history. One unique aspect of Vedic society was the expectation of those at the top of the hierarchy (Brahmins) to uphold the highest standards of righteous conduct.
Numerous scholars, including Shankaracharya, have written extensively on what it means to be a Brahmin, and how one achieves this status. While some older sources indicate that the son of a Brahmin is also a Brahmin, more contemporary sources like Shankaracharya state that it depends on one's innate nature (Vivek Chudamani).
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āśāpratīkṣe — hopes and expectations
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saṃgatam — all
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sūnṛtāṃ — merit from noble speech
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ceṣṭāpūrte — merits from sacrifice and noble work
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putrapaśūm̐śca — children and cattle
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sarvān — all
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etadvṛṅkte — all this is destroyed
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puruṣasyālpamedhaso — foolish of a man
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yasyānaśnanvasati — who stays in a house
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brāhmaṇo — Brahmin
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gṛhe — guest